| From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
|---|---|
| To: | Dirk Lutzebäck <lutzeb(at)aeccom(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Josh Berkus <josh(at)agliodbs(dot)com>, pgsql-performance(at)postgresql(dot)org, Neil Conway <neilc(at)samurai(dot)com> |
| Subject: | Re: Wierd context-switching issue on Xeon |
| Date: | 2004-04-20 16:48:14 |
| Message-ID: | 200404201648.i3KGmEV27394@candle.pha.pa.us |
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| 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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Bruce Momjian | http://candle.pha.pa.us
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