Because most MySQL production systems probably run on Linux, I’ve decided to place the most important Linux tuning tips that will help improve MySQL performance. There is nothing new here, most of them are well known, however, I’ve decided to collect those Linux configuration tips into 1 blog post.

Filesystem

ext4 (or xfs), mount with noatime

Scheduler – use deadline or noop

# echo deadline >/sys/block/sda/queue/scheduler add "elevator=deadline" to grub.conf 1 2 # echo deadline >/sys/block/sda/queue/scheduler add "elevator=deadline" to grub .conf

(For more info see Linux Schedulers in TPCC like benchmark)

Memory

Swappiness and NUMA:

# echo 0 > /proc/sys/vm/swappiness add "vm.swappiness = 0" to /etc/sysctl.conf 1 2 # echo 0 > /proc/sys/vm/swappiness add "vm.swappiness = 0" to / etc / sysctl .conf

Set numa interleave all

numactl --interleave=all 1 numactl -- interleave = all

If using Percona Server we can place it into mysqld_safe script, as Percona Server supports NUMA control.

Jeremy Cole blog contains excellent overview of NUMA as well as additional NUMA tools

(and do not forget about innodb_flush_method=O_DIRECT)

CPU

Make sure there is no powersave mode enabled:

Check /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor

and make sure it is not ondemand

Check /proc/cpuinfo and compare cpu MHz number to what is listed under the “model name”

Disable the “ondemand” if it is running

Example: “ondemand” is running on all the servers

$ ps ax| grep kondemand|wc -l 65 $ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor ondemand 1 2 3 4 $ ps ax | grep kondemand | wc - l 65 $ cat / sys / devices / system / cpu / cpu0 / cpufreq / scaling_governor ondemand

and we have this:

/proc/cpuinfo: model name : Intel(R) Xeon(R) CPU E5-4640 0 @ 2.40GHz .. cpu MHz : 1200.000 1 2 3 4 / proc / cpuinfo : model name : Intel ( R ) Xeon ( R ) CPU E5 - 4640 0 @ 2.40GHz . . cpu MHz : 1200.000

In this case we will need to disable “ondemand”.

These simple Linux tuning tips will increase MySQL performance and make it more stable (and avoid swapping). I’m am also interested in hearing about your experience with different Linux configurations and MySQL. Please share those in the comments.