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Re: Wierd context-switching issue on Xeon - Mailing list pgsql-performance

From Tom Lane
Subject Re: Wierd context-switching issue on Xeon
Date
Msg-id 14394.1082344796@sss.pgh.pa.us
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In response to Re: Wierd context-switching issue on Xeon  (Tom Lane <tgl@sss.pgh.pa.us>)
Responses Re: Wierd context-switching issue on Xeon
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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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