linux-kernel - Re: PostgreSQL pgbench performance regression in 2.6.23+

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Date:	Thu, 22 May 2008 09:10:07 +0200
From:	Mike Galbraith <efault@....de>
To:	Greg Smith <gsmith@...gsmith.com>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: PostgreSQL pgbench performance regression in 2.6.23+


On Wed, 2008-05-21 at 13:34 -0400, Greg Smith wrote:
> PostgreSQL ships with a simple database benchmarking tool named pgbench, 
> in what's labeled the contrib section (in many distributions it's a 
> separate package from the main server/client ones).  I see there's been 
> some work done already improving how the PostgreSQL server works under the 
> new scheduler (the "Poor PostgreSQL scaling on Linux 2.6.25-rc5" thread). 
> I wanted to provide you a different test case using pgbench that has taken 
> a sharp dive starting with 2.6.23, and the server improvement changes in 
> 2.6.25 actually made this problem worse.
> 
> I think it will be easy for someone else to replicate my results and I'll 
> go over the exact procedure below.

Yup, I can reproduce.  Running the test with 2.6.25.4, everything is
waking/running on one CPU, leaving my box 75% idle.  Not good.

	-Mike

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