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Date: Fri, 14 Sep 2012 20:40:32 +0200 From: Borislav Petkov <bp@...en8.de> To: Nikolay Ulyanitsky <lystor@...il.com> Cc: linux-kernel@...r.kernel.org, Andreas Herrmann <andreas.herrmann3@....com> Subject: Re: 20% performance drop on PostgreSQL 9.2 from kernel 3.5.3 to 3.6-rc5 on AMD chipsets On Fri, Sep 14, 2012 at 10:47:44AM +0300, Nikolay Ulyanitsky wrote: > Hi > I compiled the 3.6-rc5 kernel with the same config from 3.5.3 and got > the 15-20% performance drop of PostgreSQL 9.2 on AMD chipsets (880G, > 990X). > > CentOS 6.3 x86_64 > PostgreSQL 9.2 > cpufreq scaling_governor - performance > > # /etc/init.d/postgresql initdb > # echo "fsync = off" >> /var/lib/pgsql/data/postgresql.conf > # /etc/init.d/postgresql start > # su - postgres > $ psql > # create database pgbench; > # \q > > # pgbench -i pgbench && pgbench -c 10 -t 10000 pgbench > tps = 4670.635648 (including connections establishing) > tps = 4673.630345 (excluding connections establishing)[/code] Ok, I was able to reproduce it here too, albeit with different userspace (debian testing and postgres 9.1). I'll try a coarse bisection of the -rcs first, to see where the regression appeared. Thanks for reporting this. -- Regards/Gruss, Boris. -- 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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