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:	Thu, 27 Sep 2012 09:55:52 +0200
From:	Mike Galbraith <efault@....de>
To:	david@...g.hm
Cc:	Borislav Petkov <bp@...en8.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	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 Thu, 2012-09-27 at 00:17 -0700, david@...g.hm wrote:

> over the long term, the work lost due to not moving optimally right away 
> is probably much less than the work lost due to trying to figure out the 
> perfect thing to do.

Yeah, "Perfect is the enemy of good" definitely applies.  Once you're
ramped, less is more.

-Mike

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