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Message-Id: <1211440207.5733.8.camel@marge.simson.net> 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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