Crucial Exams

CompTIA Linux+ XK0-006 (V8) Practice Question

An 8-core Linux web-application server has become sluggish during peak traffic. The administrator gathers the following information:

$ uptime
 15:32:08 up 7 days,  3 users,  load average: 17.8, 18.0, 18.2

$ mpstat -P ALL 1 5 | awk '/Average/ && $2 ~ /[0-7]/ {print $2,$12}'
CPU  %idle
0    0.9
1    1.2
2    1.0
3    0.7
4    1.1
5    1.0
6    0.8
7    0.9

$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
powersave

Management asks for a quick, online change that can immediately ease the CPU saturation without adding hardware. Which action is the most appropriate first step?

  • Disable simultaneous multithreading (SMT/Hyper-Threading) in the firmware at the next maintenance window.

  • Increase the net.core.somaxconn kernel parameter to enlarge the TCP listen backlog.

  • Remount /tmp as a tmpfs to move temporary files into RAM.

  • Run cpupower frequency-set --governor performance to switch all CPUs from powersave to performance.

CompTIA Linux+ XK0-006 (V8)
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