Re: Wierd context-switching issue on Xeon

Hi

I'd LOVE to contribute on this but I don't have vmstat and I'm not running
linux.

How can I help?
Regards
On Wed, 28 Apr 2004, Robert Creager wrote:

> Date: Wed, 28 Apr 2004 18:57:53 -0600
> From: Robert Creager <Robert_Creager@LogicalChaos.org>
> To: Josh Berkus <josh@agliodbs.com>
> Cc: pg@fastcrypt.com, Dirk_Lutzebäck <lutzeb@aeccom.com>, ohp@pyrenet.fr,
>      Tom Lane <tgl@sss.pgh.pa.us>, Joe Conway <mail@joeconway.com>,
>      scott.marlowe <scott.marlowe@ihs.com>,
>      Bruce Momjian <pgman@candle.pha.pa.us>, pgsql-performance@postgresql.org,
>      Neil Conway <neilc@samurai.com>
> Subject: Re: [PERFORM] Wierd context-switching issue on Xeon
>
> When grilled further on (Wed, 21 Apr 2004 10:29:43 -0700),
> Josh Berkus <josh@agliodbs.com> confessed:
>
> > Dave,
> >
> > > After some testing if you use the current head code for s_lock.c which
> > > has some mods in it to alleviate this situation, and change
> > > SPINS_PER_DELAY to 10 you can drastically reduce the cs with tom's test.
> > > I am seeing a slight degradation in throughput using pgbench -c 10 -t
> > > 1000 but it might be liveable, considering the alternative is unbearable
> > > in some situations.
> > >
> > > Can anyone else replicate my results?
> >
> > Can you produce a patch against 7.4.1?   I'd like to test your fix against a
> > real-world database.
>
> I would like to see the same, as I have a system that exhibits the same behavior
> on a production db that's running 7.4.1.
>
> Cheers,
> Rob
>
>
>

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