linux-kernel - Re: 2.6.23 performance regression

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Message-Id: <200710311319.54210.nickpiggin@yahoo.com.au>
Date:	Wed, 31 Oct 2007 13:19:53 +1100
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	"Lorenzo Allegrucci" <l.allegrucci@...il.com>,
	"Björn" <askadar@...il.com>
Cc:	"Ingo Molnar" <mingo@...e.hu>, linux-kernel@...r.kernel.org
Subject: Re: 2.6.23 performance regression

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).
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