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Subject: Re: 20% performance drop on PostgreSQL 9.2 from kernel 3.5.3 to
 3.6-rc5 on AMD chipsets - bisected
From: Mike Galbraith <efault@gmx.de>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mel Gorman <mgorman@suse.de>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Borislav Petkov <bp@alien8.de>, Nikolay Ulyanitsky <lystor@gmail.com>,
        linux-kernel@vger.kernel.org,
        Andreas Herrmann <andreas.herrmann3@amd.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@kernel.org>
Date: Mon, 24 Sep 2012 17:51:08 +0200
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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