Here are some numbers based on pgbench:
https://www.phoronix.com/scan.php?page=article&item=linux-415-x86pti&num=2.
--
Mgr. Jiří Činčura
https://www.tabsoverspaces.com/
On Tue, Jan 9, 2018, at 16:34, Leyne, Sean wrote:
> András,
>
> > We've done some test runs with the 'old' kernel (linux-image-4.9.0-4-> >
> > amd64) and the 'new' one (linux-image-4.9.0-5-amd64).
> >
> > No. of tests: 6014
> > No. of result checks: 253555 (checking column values, stored
> > procedure> > results, etc.)
> >
> > Average running time on 4.9.0-4: 466 secs (7 mins 46 secs)
> > Average running time on 4.9.0-5: 635 secs (10 mins 35 secs)
>
> While you results are interesting, and certainly "not good", they are> not
> necessarily a reflection of global reality due to the age of your> kernel.
>
> The performance impact of the recent fixes hinge, mainly, on
> whether the> host OS/kernel has PCID support.
>
> PCID support was only added to linux kernel 4.14, released
> November 2017.>
> It would be interesting for you to rerun the tests using the
> latest kernel.>
>
> Sean
>
>
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