Re:CPU utilization is wrong [video]
by paulmd on Monday April 30, 2018 @03:10PM
(#16961327)
There's also the option of not running KPTI at all... database servers are the most heavily impacted, and since they only run trusted code there's not much point in patching them.
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Re:CPU utilization is wrong [video]
by dragontamer on Monday April 30, 2018 @03:44PM
(#16961607)
Hmmm... I don't like the idea of disabling security for performance.
I'm not an expert on this, but I'd turn on Huge Tables (1GB) first. Big databases / datasets across RAM can be manipulated in 1GB chunks by the OS instead of 4kB (!!!) chunks. The Skylake CPU can only cache ~4 Huge Tables, but an additional set of Large Tables (2MB) should also help performance. If properly configured of course.
I would hope that those changes would mitigate most of the KPTI issues with regards to databases. But I really don't know.