Horton

Re: Wierd context-switching issue on Xeon

Bruce Momjian <pgman@candle.pha.pa.us>

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From: Bruce Momjian <pgman@candle.pha.pa.us>
To: Dirk Lutzebäck <lutzeb@aeccom.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>, Josh Berkus <josh@agliodbs.com>, pgsql-performance@postgresql.org, Neil Conway <neilc@samurai.com>
Date: 2004-04-20T16:48:14Z
Lists: pgsql-performance 
Dirk Lutzebck wrote:
> Dirk Lutzebaeck wrote:
> 
> > c) Dual XEON DP, non-bigmem, HT on, E7500 Intel chipset (Supermicro)
> >
> > performs well and I could not observe context switch peaks here (one 
> > user active), almost no extra semop calls
> 
> Did Tom's test here: with 2 processes I'll reach 200k+ CS with peaks to 
> 300k CS. Bummer.. Josh, I don't think you can bash the ServerWorks 
> chipset here nor bigmem.

Dave Cramer reproduced the problem on my SuperMicro dual Xeon on BSD/OS.

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