Hyperthreading slows processes?

From: "Craig A(dot) James" <cjames(at)modgraph-usa(dot)com>
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Cc: pgsql-performance(at)postgresql(dot)org
Subject: Hyperthreading slows processes?
Date: 2005-11-20 21:46:10
Message-ID: 4380EEA2.4010002@modgraph-usa.com
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This article on ZDNet claims that hyperthreading can *hurt* performance, due to contention in the L1/L2 cache by a second process:

http://news.zdnet.co.uk/0,39020330,39237341,00.htm

Has anyone tested this on Postgres yet? (And based on a recent somewhat caustic thread about performance on this forum, I'm going to avoid speculation, and let those who actually *know* answer! ;-)

Craig

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