linux-kernel - Re: 20% performance drop on PostgreSQL 9.2 from kernel 3.5.3 to 3.6-rc5 on AMD chipsets

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Message-ID: <1348501868.6991.230.camel@marge.simpson.net>
Date:	Mon, 24 Sep 2012 17:51:08 +0200
From:	Mike Galbraith <efault@....de>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Mel Gorman <mgorman@...e.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Borislav Petkov <bp@...en8.de>,
	Nikolay Ulyanitsky <lystor@...il.com>,
	linux-kernel@...r.kernel.org,
	Andreas Herrmann <andreas.herrmann3@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: 20% performance drop on PostgreSQL 9.2 from kernel 3.5.3 to
 3.6-rc5 on AMD chipsets - bisected

On Mon, 2012-09-24 at 17:30 +0200, Peter Zijlstra wrote:

> Anyway, does anybody have any clue as to why AMD and Intel machine
> behave significantly different here? Does an Intel box with HT disabled
> behave similar to AMD? or is it something about the micro-architecture?

If you mean pgbench, it should act about the same on both.  As soon as
pgbench starts using significant CPU and has to compete, it'll start
having trouble.

-Mike

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