From: Jeffrey Baker <jwbaker@gmail.com>
To: Greg Smith <gsmith@gregsmith.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Strange behavior: pgbench and new Linux kernels
Date: Thu, 17 Apr 2008 10:09:09 -0700
Message-ID: <fd145f7d0804171009h7658d3bbqf099b5c0e9235268@mail.gmail.com> (raw)
In-Reply-To: <Pine.GSO.4.64.0804170230180.26917@westnet.com>
References: <Pine.GSO.4.64.0804170230180.26917@westnet.com>
On Thu, Apr 17, 2008 at 12:58 AM, Greg Smith <gsmith@gregsmith.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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To: pgsql-performance@postgresql.org
Cc: jwbaker@gmail.com, gsmith@gregsmith.com
Subject: Re: Strange behavior: pgbench and new Linux kernels
In-Reply-To: <fd145f7d0804171009h7658d3bbqf099b5c0e9235268@mail.gmail.com>
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