Real-Time Linux Interview Questions and Answers [2025]

Real-time Linux systems drive time-critical applications in 2025, such as IoT, automotive, and industrial control. This guide offers 101 unique scenario-based questions covering Linux fundamentals, real-time kernels, scripting, networking, security, and troubleshooting. Each answer ensuring thorough preparation for real-time Linux engineer interviews.

Linux Fundamentals

1. What steps would you take if a real-time Linux system fails to boot?

• Check kernel logs
• Verify GRUB settings
• Test hardware integrity
• Boot into rescue mode
  Boot failures halt time-sensitive operations. Reviewing logs and bootloader configurations pinpoints issues, while hardware tests ensure system reliability, a core skill for maintaining deterministic performance in real-time Linux environments like industrial automation.

2. How would you verify the real-time kernel version on a Linux system?

To confirm the real-time kernel version, run uname -r to display the kernel release, including PREEMPT_RT patches. This ensures compatibility with time-critical tasks, a fundamental task for managing low-latency systems in embedded or automotive applications.

3. Why would a real-time Linux system experience high latency?

• Non-optimized kernel
• Interrupt conflicts
• Resource contention
  High latency disrupts deterministic timing.
  Using cyclictest identifies delay sources.
  Tuning kernel parameters ensures low-latency performance, a key skill for real-time systems.

4. When would you apply the PREEMPT_RT patch in a Linux system?

PREEMPT_RT is used for low-latency applications like robotics or telecom requiring predictable response times.

• Enhances kernel preemption
• Applied during compilation
• Ensures timing precision, a core real-time Linux requirement

5. Where would you find real-time system logs on a Linux server?

cat /var/log/kern.log
# or
journalctl -k

Access logs in /var/log/kern.log or via journalctl -k for kernel events. This aids debugging real-time issues, a critical skill for ensuring consistent performance in time-sensitive systems like IoT.

6. Who would configure a real-time Linux system, and why?

• Embedded engineers
• Achieve low latency
• Support critical tasks
  Real-time systems demand precise setups. Engineers configure them to meet deterministic requirements, a vital skill for industries like aerospace or automotive where timing is critical.

7. Which command displays CPU scheduling details in real-time Linux?

• chrt -r
• Lists process priorities
• Verifies scheduling policies
  Scheduling details ensure predictable execution.
  This command is essential for managing time-critical tasks in real-time environments.

8. What would you do if a real-time process misses its deadline?

If a process misses deadlines, verify scheduling priority, CPU affinity, and interrupt settings. Missed deadlines disrupt timing-critical operations.

• Adjust with chrt
• Set affinity via taskset
• Monitor with htop
  This ensures deterministic behavior in real-time systems.

9. How would you set real-time priority for a process in Linux?

chrt -r -p 60 

Use chrt to assign a real-time priority (e.g., 60) to a process. This guarantees timely execution, a core task for managing deterministic tasks in real-time Linux systems like industrial control.

10. Why would a real-time Linux system experience jitter?

• Interrupt latency
• Non-RT kernel
• CPU contention
  Jitter affects timing precision.
  Testing with cyclictest pinpoints causes.
  Optimizing interrupts restores stability, a critical skill for real-time applications.

11. When would you use sched_deadline in a real-time Linux system?

Sched_deadline is used for tasks with strict timing requirements, like automotive control, ensuring precise scheduling.

• Set via sched_setattr
• Monitors with schedtool
• Guarantees deadlines, a key real-time Linux principle

12. Where would you configure kernel parameters for real-time performance?

• Edit /etc/sysctl.conf
• Tune sched_rt_period_us
• Apply with sysctl -p
  Kernel tuning optimizes deterministic performance.
  This practice is vital for managing low-latency systems in critical applications.

13. Who would optimize a Linux kernel for real-time applications, and why?

• Kernel developers
• Minimize latency
• Ensure predictability
  Kernel optimization supports time-critical tasks. Developers tune it for reliability, a core skill for embedded systems like robotics or telecom.

14. Which command checks real-time process status in Linux?

ps -eo pid,rtprio,comm

Use ps to list real-time process priorities. This verifies scheduling accuracy, a critical task for ensuring deterministic execution in time-sensitive Linux environments like industrial automation.

15. What would you do if a real-time Linux system crashes during operation?

• Review kernel logs
• Check RT patches
• Inspect hardware
  Crashes disrupt time-critical tasks. Checking logs with dmesg and verifying patches resolves issues, a key skill for maintaining predictable performance in real-time environments like IoT.

System Administration

16. How would you install a real-time kernel on a Linux system?

To install a real-time kernel, download PREEMPT_RT patches, apply them to kernel source, compile, and install. This ensures low-latency performance, a fundamental task for managing time-sensitive systems in embedded or automotive applications.

17. Why would a real-time service fail to start on a Linux system?

• Missing RT kernel
• Incorrect configuration
• Dependency conflicts
  Service failures disrupt timing.
  Checking systemctl status identifies issues.
  Installing RT kernel restores functionality, a critical real-time Linux skill.

18. When would you use isolcpus in a real-time Linux system?

Isolcpus dedicates CPUs to real-time tasks, reducing interference for low-latency applications.

• Set in /etc/default/grub
• Applied via GRUB update
• Enhances determinism, a core real-time requirement

19. Where would you configure real-time scheduling policies?

sudo nano /etc/security/limits.conf
# Add: @rtgroup - rtprio 95

Edit /etc/security/limits.conf to set real-time priorities. This ensures predictable scheduling, a vital task for managing time-critical processes in embedded systems like robotics.

20. Who would configure a real-time Linux server for IoT, and why?

• IoT engineers
• Ensure low latency
• Enable device control
  Real-time systems support precise IoT operations. Engineers configure them for reliability, a core skill for time-sensitive applications like smart grids.

21. Which command monitors disk I/O for real-time systems?

• iostat -x
• Displays disk metrics
• Detects bottlenecks
  Disk I/O monitoring prevents timing issues.
  This command is essential for maintaining real-time system performance.

22. What would you do if a real-time Linux system runs out of memory?

If memory is low, check usage, terminate non-critical processes, and optimize swap. Memory shortages disrupt timing.

• Monitor with free -m
• Tune vm.swappiness
• Check logs
  This ensures deterministic behavior in real-time systems.

23. How would you update a real-time Linux system without downtime?

sudo apt update
sudo apt upgrade -y

Use apt to update packages, ensuring RT kernel compatibility. This maintains deterministic performance, a core task for updating time-sensitive systems in critical applications like automotive control.

24. Why would a real-time process be preempted unexpectedly?

• Higher-priority tasks
• Interrupt conflicts
• Kernel misconfiguration
  Unexpected preemption disrupts timing.
  Checking chrt verifies priorities.
  Adjusting scheduling ensures determinism, a key real-time Linux skill.

25. When would you use cpuset for real-time Linux tasks?

Cpuset isolates CPUs for real-time tasks, ensuring low latency in critical applications.

• Configured in /sys/fs/cgroup/cpuset
• Monitors with cpuset commands
• Optimizes performance, a core real-time principle

26. Where would you check real-time kernel configuration?

• Check /proc/config.gz
• Use zcat /proc/config.gz
• Verify RT options
  Kernel config verification ensures real-time support.
  This is vital for managing low-latency systems in critical applications.

27. Who would manage real-time Linux system resources, and why?

• System engineers
• Optimize performance
• Ensure determinism
  Resource management supports time-critical tasks. Engineers optimize for reliability, a core skill for industries like telecom or aerospace.

28. Which command checks interrupt latency in real-time Linux?

cyclictest -m -n -p 90 -t1 -D10s

Use cyclictest to measure interrupt latency. This ensures predictable performance, a critical task for troubleshooting time-sensitive systems in embedded environments like robotics.

Scripting and Automation

29. What would you do if a real-time script fails to execute on time?

• Verify scheduling priority
• Check script logic
• Review logs
  Script delays disrupt deterministic operations. Checking priorities and logs with chrt and journalctl resolves issues, a key task for automating time-critical processes in real-time systems.

30. How would you write a Bash script for real-time monitoring?

#!/bin/bash
while true; do
    latency=$(cyclictest -t1 -p90 -n -m -D10s | grep Max | awk '{print $4}')
    if [ $latency -gt 100 ]; then
        echo "High latency: $latency us" | mail -s "RT Alert" [email protected]
    fi
    sleep 10
done

This script monitors real-time latency and alerts if high. It ensures timing precision, a core task for automating time-sensitive systems in applications like industrial control.

31. Why would a real-time script consume excessive CPU?

• Inefficient loops
• Unoptimized code
• High-priority tasks
  Excessive CPU usage affects timing.
  Monitoring with top identifies issues.
  Optimizing code ensures efficiency, a critical real-time Linux skill.

32. When would you use Python for real-time automation in Linux?

Python automates complex real-time tasks, like monitoring or control, due to its flexibility.

• Uses sched module
• Logs with logging
• Ensures reliability, a core real-time requirement

33. Where would you store real-time scripts on a Linux system?

• Store in /usr/local/bin
• Set executable permissions
• Ensure system-wide access
  Script storage ensures automation availability.
  This practice is vital for managing time-critical tasks in real-time systems.

34. Who would automate real-time task scheduling, and why?

• DevOps engineers
• Ensure timely execution
• Optimize resources
  Automation supports deterministic scheduling. Engineers implement it for reliability, a core skill for time-sensitive applications like IoT.

35. Which command validates real-time script syntax?

bash -n rt_script.sh

Use bash -n to check script syntax without execution. This prevents errors, a critical task for ensuring reliable automation in time-sensitive Linux systems like automotive control.

36. What would you do if a cron job misses real-time deadlines?

If a cron job misses deadlines, verify scheduling, adjust priority, and check logs. Missed jobs disrupt timing.

• Set priority with chrt
• Review /var/log/cron
• Optimize scripts
  This ensures deterministic automation in real-time systems.

37. How would you automate real-time log analysis in Linux?

To automate log analysis, write a script to parse /var/log/kern.log and alert on latency issues. This maintains timing precision, a core task for monitoring time-critical systems in applications like telecom.

38. Why would a Python real-time script fail to meet deadlines?

• Blocking calls
• Resource contention
• Low priority
  Script failures disrupt timing.
  Debugging with pdb identifies issues.
  Adjusting priority ensures determinism, a key real-time Linux skill.

39. When would you use Ansible for real-time Linux automation?

Ansible configures multiple real-time servers consistently, ensuring low latency.

• Uses RT playbooks
• Runs with ansible-playbook
• Supports scalability, a core real-time principle

40. Where would you store real-time Ansible playbooks?

mkdir /etc/ansible/rt_playbooks
mv rt_playbook.yml /etc/ansible/rt_playbooks/

Store playbooks in /etc/ansible/rt_playbooks for centralized management. This organizes automation, a vital task for managing time-sensitive systems in critical applications like robotics.

Networking

41. Who would configure real-time networking on a Linux system, and why?

• Network engineers
• Ensure low-latency
• Support time-critical apps
  Real-time networking ensures fast communication. Engineers configure it for performance, a core skill for applications like industrial automation.

42. Which command monitors real-time network latency in Linux?

• ping -i 0.1
• Measures round-trip time
• Detects delays
  Network latency monitoring ensures performance.
  This command is essential for managing time-sensitive networks.

43. What would you do if a real-time Linux system drops network packets?

• Check NIC settings
• Verify QoS rules
• Monitor with tcpdump
  Packet drops disrupt communication. Checking settings with ifconfig and tc resolves issues, a key task for maintaining low-latency networks in real-time systems.

44. How would you configure a Linux system for real-time networking?

sudo sysctl -w net.core.netdev_max_backlog=5000
sudo tc qdisc add dev eth0 root tbf rate 100mbit burst 32kbit latency 10ms

Tune kernel parameters and apply traffic control for low-latency networking. This ensures real-time performance, a core task for time-critical applications like telecom.

45. Why would a real-time Linux system experience network jitter?

• Congested links
• Misconfigured QoS
• Interrupt issues
  Jitter affects communication timing.
  Checking tc pinpoints causes.
  Optimizing QoS ensures stability, a critical real-time Linux skill.

46. When would you use VLANs for real-time Linux networking?

VLANs isolate real-time traffic for low latency and security in critical applications.

• Configured with ip link add
• Monitors with ip vlan
• Enhances performance, a core real-time principle

47. Where would you configure real-time network priorities?

• Edit /etc/sysctl.conf
• Set net.core parameters
• Apply with sysctl -p
  Network priority tuning ensures low latency.
  This is vital for time-sensitive network configurations.

48. Who would set up a real-time Linux system as a router, and why?

• Network engineers
• Enable fast routing
• Support real-time apps
  Routing ensures low-latency communication. Engineers configure it for performance, a core skill for time-critical networks.

49. Which command checks real-time network interface status?

ip -s link show eth0

Use ip to monitor interface statistics. This ensures low-latency networking, a critical task for troubleshooting time-sensitive systems in applications like IoT.

50. What would you do if a real-time Linux system fails to resolve DNS?

If DNS fails, check /etc/resolv.conf, verify network, and test with dig. DNS issues disrupt connectivity.

• Update resolver settings
• Check systemd-resolved
• Review logs
  This maintains reliable communication in real-time systems.

51. How would you optimize a Linux system for real-time UDP traffic?

To optimize UDP traffic, configure QoS, prioritize packets, and tune kernel buffers. This ensures low-latency communication, a core task for real-time systems in applications like industrial control or telecom.

Security

52. Why would a real-time Linux system reject legitimate SSH logins?

• Misconfigured SSHD
• Firewall restrictions
• Invalid keys
  SSH failures block access.
  Checking /etc/ssh/sshd_config identifies issues.
  Fixing settings restores access, a critical real-time Linux skill.

53. When would you use SELinux for real-time Linux security?

SELinux enforces strict access controls in real-time systems for enhanced security.

• Configured in /etc/selinux/config
• Monitors with getenforce
• Protects critical apps, a core real-time principle

54. Where would you configure real-time firewall rules?

sudo iptables -A INPUT -p udp --dport 1234 -j ACCEPT
sudo iptables-save > /etc/iptables/rules.v4

Set iptables rules for real-time traffic. This ensures secure communication, a vital task for protecting time-sensitive systems in applications like automotive control.

55. Who would secure a real-time Linux system, and why?

• Security engineers
• Protect critical apps
• Ensure system integrity
  Security safeguards time-critical operations. Engineers implement it for reliability, a core skill for real-time environments like IoT.

56. Which command checks real-time system security logs?

• journalctl -u sshd
• Shows access attempts
• Tracks violations
  Security log monitoring prevents breaches.
  This command is essential for securing time-sensitive systems.

57. What would you do if a real-time Linux system detects unauthorized access?

If unauthorized access occurs, review logs, restrict accounts, and update security. Breaches risk timing disruptions.

• Check auth.log
• Update passwords
• Apply firewall rules
  This protects deterministic performance in real-time systems.

58. How would you secure a real-time Linux system against brute-force attacks?

sudo apt install fail2ban
sudo nano /etc/fail2ban/jail.local
# Add: [sshd]
# enabled = true
# maxretry = 3
sudo systemctl restart fail2ban

Install fail2ban and configure SSH protection. This blocks brute-force attempts, a core task for securing time-critical systems in applications like industrial automation.

59. Why would a real-time Linux system’s service fail to start securely?

• SELinux restrictions
• Permission issues
• Port conflicts
  Service failures disrupt operations.
  Checking audit.log identifies causes.
  Adjusting SELinux ensures functionality, a key real-time Linux skill.

60. When would you use AppArmor for real-time Linux security?

AppArmor restricts real-time applications to enhance security in critical systems.

• Configured in /etc/apparmor.d
• Monitors with aa-status
• Protects time-sensitive apps, a core real-time principle

61. Where would you store SSH keys for real-time Linux systems?

• Store in ~/.ssh/authorized_keys
• Set strict permissions
• Ensure secure access
  Key storage ensures secure management.
  This is vital for time-critical system administration.

62. Who would audit real-time Linux system security, and why?

• Security engineers
• Identify vulnerabilities
• Ensure compliance
  Audits protect time-sensitive operations. Engineers perform them for safety, a core skill for real-time environments like telecom.

63. Which command scans for real-time system vulnerabilities?

sudo lynis audit system

Use lynis to audit system security. This identifies vulnerabilities, a critical task for securing time-sensitive Linux systems in applications like robotics.

Troubleshooting

64. What would you do if a real-time Linux system experiences a kernel panic?

• Review kernel logs
• Verify RT patches
• Check hardware
  Kernel panics halt time-critical tasks. Checking logs with dmesg and patches resolves issues, a key task for maintaining predictable performance in real-time systems.

65. How would you troubleshoot high interrupt latency in real-time Linux?

cyclictest -m -n -p 90 -t1 -D10s

Use cyclictest to measure latency and identify interrupt issues. This ensures deterministic performance, a core task for troubleshooting time-sensitive systems in embedded applications like IoT.

66. Why would a real-time process fail to meet timing requirements?

• Low priority
• Resource contention
• Kernel misconfiguration
  Timing failures disrupt determinism.
  Checking chrt verifies priorities.
  Optimizing resources ensures performance, a critical real-time Linux skill.

67. When would you use strace for real-time Linux troubleshooting?

Strace debugs system calls for real-time process timing issues.

• Traces with strace -T
• Logs with strace -o
• Enhances diagnostics, a core real-time principle

68. Where would you check real-time system performance metrics?

• Use perf stat
• Monitors CPU usage
• Tracks latency
  Performance monitoring ensures timing precision.
  This command is vital for managing time-sensitive systems.

69. Who troubleshoots real-time Linux system failures, and why?

• System engineers
• Restore determinism
• Ensure reliability
  Engineers diagnose failures for consistent performance, a core skill for real-time applications like automotive control.

70. Which command monitors real-time process CPU usage?

top -R

Use top -R to monitor real-time process CPU usage. This ensures performance, a critical task for troubleshooting time-sensitive systems in applications like industrial automation.

71. What would you do if a real-time Linux system’s filesystem is read-only?

If read-only, remount with write permissions, run fsck, and check logs. Read-only filesystems block updates.

• Use mount -o remount,rw /
• Run fsck /dev/sda1
• Review kern.log
  This maintains system functionality in real-time environments.

72. How would you troubleshoot a slow real-time network connection?

To troubleshoot slow networking, check latency, QoS, and NIC settings. Slow connections disrupt time-critical communication, a core task for ensuring low-latency performance in applications like telecom.

73. Why would a real-time Linux system fail to resolve hostnames?

• DNS misconfiguration
• Network issues
• Resolver errors
  DNS failures block connectivity.
  Checking /etc/resolv.conf identifies causes.
  Fixing settings restores access, a key real-time Linux skill.

74. When would you use journalctl for real-time Linux troubleshooting?

Journalctl analyzes systemd logs for real-time system issues.

• Filters with journalctl -u
• Monitors with journalctl -f
• Enhances diagnostics, a core real-time principle

75. Where would you check real-time kernel panic logs?

dmesg | grep -i panic
# or
cat /var/log/kern.log

Check dmesg or /var/log/kern.log for panic details. This diagnoses crashes, a vital task for troubleshooting time-sensitive systems in applications like robotics.

Advanced Topics

76. Who would configure a real-time Linux system for automotive use, and why?

• Automotive engineers
• Ensure low latency
• Support safety systems
  Real-time systems drive automotive safety. Engineers configure them for reliability, a core skill for time-critical applications.

77. Which command checks real-time kernel modules?

• lsmod | grep rt
• Lists RT modules
• Verifies support
  Module checks ensure real-time functionality.
  This command is essential for managing time-sensitive systems.

78. What would you do if a real-time Linux system runs out of inodes?

• Check with df -i
• Delete unused files
• Resize filesystem
  Inode exhaustion blocks file creation. Checking and freeing inodes restores functionality, a key task for managing time-critical storage systems.

79. How would you configure a real-time Linux system for Docker?

sudo apt install docker.io
sudo sysctl -w kernel.sched_rt_runtime_us=-1
sudo systemctl enable docker

Install Docker and tune kernel for real-time. This enables containerized time-critical apps, a core task for modern systems like IoT.

80. Why would a real-time container fail to start?

• Missing RT kernel
• Resource limits
• Config errors
  Container failures disrupt applications.
  Checking docker logs identifies issues.
  Fixing configs ensures functionality, a critical real-time Linux skill.

81. When would you use Kubernetes for real-time Linux systems?

Kubernetes orchestrates real-time containers for scalable time-critical applications.

• Manages RT pods
• Configured with kubectl
• Ensures scalability, a core real-time principle

82. Where would you store real-time Docker images?

• Store in /var/lib/docker
• Manage with docker images
• Optimize storage
  Image storage ensures container availability.
  This is vital for time-critical containerized systems.

83. Who would optimize a real-time Linux system for high availability, and why?

• System architects
• Ensure uptime
• Support critical apps
  High availability prevents downtime. Architects optimize for reliability, a core skill for real-time applications like telecom.

84. Which command monitors real-time container performance?

docker stats --format "{{.Name}}: {{.CPUPerc}}"

Use docker stats to track container CPU usage. This ensures performance, a critical task for managing containerized time-sensitive applications.

85. What would you do if a real-time Linux kernel module fails to load?

If a module fails, check modprobe, verify module availability, and review logs. Failures disrupt functionality.

• Use lsmod to check
• Run modprobe rt_module
• Review dmesg
  This maintains system reliability in real-time environments.

86. How would you configure a real-time Linux system for NFS?

To configure NFS, install nfs-kernel-server, export directories, and prioritize real-time traffic. This enables low-latency file sharing, a core task for time-critical systems in applications like industrial control.

87. Why would a real-time Linux system fail to join a cluster?

• Network latency
• Misconfigured nodes
• RT kernel issues
  Cluster failures disrupt scalability.
  Checking logs identifies causes.
  Fixing configs ensures functionality, a key real-time Linux skill.

88. When would you use rsync for real-time Linux data transfer?

Rsync syncs files for real-time backups or migrations in critical systems.

• Configured with rsync -av
• Monitors with --progress
• Ensures data integrity, a core real-time principle

89. Where would you configure real-time systemd services?

sudo nano /etc/systemd/system/rt_service.service
sudo systemctl daemon-reload

Create service files in /etc/systemd/system. This manages time-critical services, a vital task for automating applications in real-time environments like robotics.

90. Who would configure a real-time Linux system for virtualization, and why?

• System engineers
• Host RT VMs
• Optimize resources
  Virtualization maximizes hardware usage. Engineers configure it for performance, a core skill for time-critical applications.

Real-Time Specific

91. Which command verifies real-time scheduling parameters?

• schedtool -r
• Shows RT settings
• Confirms priorities
  Scheduling verification ensures timing precision.
  This command is essential for managing time-sensitive tasks.

92. What would you do if a real-time Linux system exceeds latency thresholds?

• Test with cyclictest
• Adjust priorities
• Optimize interrupts
  High latency disrupts determinism. Tuning with chrt and sysctl ensures performance, a key task for maintaining time-critical systems like IoT.

93. How would you configure a real-time Linux system for robotics?

sudo sysctl -w kernel.sched_rt_runtime_us=-1
sudo chrt -r -p 80 

Tune kernel for unlimited RT runtime and set process priority. This ensures deterministic robotics control, a core task for time-sensitive applications.

94. Why would a real-time Linux system miss periodic task deadlines?

• Overloaded CPU
• Low priority
• Interrupt issues
  Missed deadlines affect performance.
  Checking top identifies causes.
  Adjusting priorities ensures timing, a critical real-time Linux skill.

95. When would you use SCHED_FIFO for real-time Linux tasks?

SCHED_FIFO prioritizes high-priority tasks for strict execution order.

• Set with chrt -f
• Monitors with ps -eo
• Ensures determinism, a core real-time principle

96. Where would you check real-time interrupt conflicts?

• Check /proc/interrupts
• Use cat /proc/interrupts
• Identify conflicts
  Interrupt conflict checks ensure low latency.
  This is vital for time-sensitive system performance.

97. Who would tune a real-time Linux system for telecom, and why?

• Telecom engineers
• Ensure low latency
• Support fast communication
  Real-time tuning ensures telecom reliability. Engineers optimize for performance, a core skill for time-critical networks.

98. Which command monitors real-time system memory usage?

free -m -s 1

Use free -m to monitor memory in real-time. This ensures resource availability, a critical task for troubleshooting time-sensitive systems in applications like industrial automation.

99. What would you do if a real-time Linux system’s clock drifts?

If the clock drifts, check NTP, adjust kernel parameters, and sync time. Clock drift affects timing.

• Use ntpdate for sync
• Verify timedatectl
• Review logs
  This maintains deterministic performance in real-time systems.

100. How would you configure a real-time Linux system for CAN bus?

sudo modprobe can
sudo ip link set can0 type can bitrate 500000
sudo ip link set up can0

Load CAN module and configure bitrate. This enables real-time communication, a core task for automotive or industrial systems.

101. Why would a real-time Linux system fail to meet QoS requirements?

• Misconfigured QoS
• Network congestion
• Kernel issues
  QoS failures disrupt performance.
  Checking tc identifies causes.
  Optimizing settings ensures reliability, a key real-time Linux skill.

Tips to Ace Real-Time Linux Interviews

• Practice real-time kernel compilation
• Build RT scheduling labs
• Master cyclictest and chrt
• Study PREEMPT_RT and scheduling
• Review Linux documentation
• Explain solutions clearly with technical precision