Re: 2.6.23 performance regression

[Ingo Molnar <mingo@elte.hu>]

* Nick Piggin <nickpiggin@yahoo.com.au> wrote:

> On Tuesday 30 October 2007 18:54, Lorenzo Allegrucci wrote:
> > Hi, sorry if this is a faq but reading
> > http://people.freebsd.org/~kris/scaling/7.0%20Preview.pdf (slides 17,
> > 18)
> > looks like 2.6.23 is having a performance regression on MySQL and
> > PostgreSQL benchmarks.  Has anyone investigated these?
> 
> I think Ingo was looking into them. I'm just in the middle of building 
> a new setup to investigate some performance issues too, so I hope to 
> look at this.
> 
> Apparently it did go unnoticed during CFS testing, unfortunately. 
> Although now it has been brought to light, I think 2.6.24 is supposed 
> to be better (although it now gets worse on other things).

yep. For those who fear the 1 million lines of code flux of 2.6.24, 
here's a backport of the scheduler changes to 2.6.23:

  http://people.redhat.com/mingo/cfs-scheduler/devel/sched-cfs-v2.6.23.1-v22.1-rc0.patch

Lorenzo, could you please try that report back your reports? Thanks,

	Ingo
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