Re: Issue with Linux+Pentium SMP Context Switching

From: Shridhar Daithankar <shridhar_daithankar(at)myrealbox(dot)com>
To: pgsql-hackers(at)postgresql(dot)org
Subject: Re: Issue with Linux+Pentium SMP Context Switching
Date: 2003-12-20 06:50:08
Message-ID: 200312201220.08675.shridhar_daithankar@myrealbox.com
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On Saturday 20 December 2003 00:00, Josh Berkus wrote:
> In discussions with Linux kernel hackers online, they blame the way that
> PostgreSQL uses shared memory. Whether or not they are correct, the
> effect of the issue is to harm PostgreSQL's performance and make us look
> bad on one of the major "enterprise" systems of choice: the multi-processor
> Xeon system.

Two suggestions..

1. Patch linux kernel for HT aware scheduler.
2. Try running Xeons in HTdisabled modes.

See if that helps. I would say using 2.6 on it is recommended anyways.. If
possible of course..

Shridhar

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