Horton

Re: Wierd context-switching issue on Xeon

Tom Lane <tgl@sss.pgh.pa.us>

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From: Tom Lane <tgl@sss.pgh.pa.us>
To: pg@fastcrypt.com
Cc: lutzeb@aeccom.com, Josh Berkus <josh@agliodbs.com>, pgsql-performance@postgresql.org, Neil Conway <neilc@samurai.com>
Date: 2004-04-19T03:19:56Z
Lists: pgsql-performance 
>> 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