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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Date:	Wed, 26 Sep 2012 18:32:33 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mike Galbraith <efault@....de>, Mel Gorman <mgorman@...e.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>,
	Suresh Siddha <suresh.b.siddha@...el.com>
Subject: Re: 20% performance drop on PostgreSQL 9.2 from kernel 3.5.3 to
 3.6-rc5 on AMD chipsets - bisected

On Tue, Sep 25, 2012 at 10:21:28AM -0700, Linus Torvalds wrote:
> How does pgbench look? That's the one that apparently really wants to
> spread out, possibly due to user-level spinlocks. So I assume it will
> show the reverse pattern, with "kill select_idle_sibling" being the
> worst case. Sad, because it really would be lovely to just remove that
> thing ;)

Yep, correct. It hurts.

v3.6-rc7-1897-g28381f207bd7 (linus from 26/9 + tip/auto-latest) + performance governor

tps = 4574.570857 (including connections establishing)
tps = 4579.166159 (excluding connections establishing)

v3.6-rc7-1897-g28381f207bd7 (linus from 26/9 + tip/auto-latest) + performance governor + kill select_idle_sibling

tps = 2230.354093 (including connections establishing)
tps = 2231.412169 (excluding connections establishing)


-- 
Regards/Gruss,
Boris.
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