Red Hat memory optimisations and Riak performance

Re:Red Hat memory optimisations and Riak performance by jermo on Thursday April 23, 2015 @09:26AM (#9426475)

They're not the only ones running into issues with TPH and numa. For more suggestions to reduce jitter on Linux see Gil Tene's (Azul) advice: http://highscalability.com/blog/2015/4/8/the-black-magic-of-...

Namely:

  - Turn THP (Transparent Huge Pages) OFF.

  - Set vm.min_free_kbytes to AT LEAST 1GB (8GB on larger systems).  

  - Set Swappiness to 0.  

  - Set zone_reclaim_mode to 0.

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Re:Red Hat memory optimisations and Riak performance by geidies on Thursday April 23, 2015 @10:32AM (#9426927)

Good advise - but a swappiness = 0 setting can bite you as well. See an explanation in http://www.chinanetcloud.com/blog/attack-of-the-killer-kerne... and why we set swappiness = 1.

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