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Re: Any conclusion on the Xeon context-switching issue?

From: Richard Huxton <dev(at)archonet(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Any conclusion on the Xeon context-switching issue?
Date: 2006-02-27 16:54:30
Message-ID: 44032EC6.8020103@archonet.com (view raw or flat)
Thread:
Lists: pgsql-hackers
Tom Lane wrote:
> Richard Huxton <dev(at)archonet(dot)com> writes:
>> Subject says it all really. I've got a new client who seems to be
>> suffering from it, and I'm not sure if any conclusion was reached.
> 
> What's he using?  8.1 seems to have alleviated the problem somewhat,
> and I've done more work in CVS tip.  It'll never go away entirely,
> because these chips are just not very good at sharing memory, but
> we've certainly reduced it quite a bit from where it was in 7.x.

7.4.12 (.12 as of last week). I've seen context-switching peak at 80000 
on a quad-Xeon that really shouldn't be straining.

An upgrade is possible, but obviously needs testing against. Would your 
CVS changes be against 8.2-to-be or 8.1.x?

--
   Richard Huxton
   Archonet Ltd

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