Re: Wierd context-switching issue on Xeon

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: pg(at)fastcrypt(dot)com
Cc: lutzeb(at)aeccom(dot)com, 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: 2004-04-19 03:19:56
Message-ID: 14394.1082344796@sss.pgh.pa.us
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>> What about hypterthreading does it still happen if HTT is turned off ?

> The problem comes from keeping the caches synchronized between multiple
> physical CPUs. AFAICS enabling HTT wouldn't make it worse, because a
> hyperthreaded processor still only has one cache.

Also, I forgot to say that the numbers I'm quoting *are* with HTT off.

regards, tom lane

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