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Date: Wed, 31 Oct 2007 10:55:17 +0100 From: Ingo Molnar <mingo@...e.hu> To: Nick Piggin <nickpiggin@...oo.com.au> Cc: Lorenzo Allegrucci <l.allegrucci@...il.com>, Bj?rn <askadar@...il.com>, linux-kernel@...r.kernel.org, Peter Zijlstra <a.p.zijlstra@...llo.nl> Subject: Re: 2.6.23 performance regression * Nick Piggin <nickpiggin@...oo.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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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