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Re: Strange behavior: pgbench and new Linux kernels

From: "Jeffrey Baker" <jwbaker(at)gmail(dot)com>
To: "Greg Smith" <gsmith(at)gregsmith(dot)com>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: Strange behavior: pgbench and new Linux kernels
Date: 2008-04-17 17:09:09
Message-ID: fd145f7d0804171009h7658d3bbqf099b5c0e9235268@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-performance
On Thu, Apr 17, 2008 at 12:58 AM, Greg Smith <gsmith(at)gregsmith(dot)com> wrote:
>  So in the case of this simple benchmark, I see an enormous performance
> regression from the newest Linux kernel compared to a much older one.

This has been discussed recently on linux-kernel.  It's definitely a
regression.  Instead of getting a nice, flat overload behavior when
the # of busy threads exceeds the number of CPUs, you get the
declining performance you noted.

Poor PostgreSQL scaling on Linux 2.6.25-rc5 (vs 2.6.22)
http://marc.info/?l=linux-kernel&m=120521826111587&w=2

-jwb

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