[KLUG Advocacy] More on Hyperthreading goodness
Chester Wisniewski
chetw at zuzax.com
Sat Nov 19 20:10:38 EST 2005
I recall a brief email banter a while back where I suggested
hyperthreading was detrimental and Adam and I jousted back and forth a
bit... more info from a slashdot article citing Microsoft and Citrix
/"ZDNet is reporting that enabling Intel's new Hyperthreading Technology
on your servers could lead to markedly decreased performance
<http://news.zdnet.co.uk/0,39020330,39237341,00.htm>, according to some
developers who have been looking into problems that have been occurring
since HT has been shipping automatically activated. One MS developer
from the SQL server team put it simply: 'Our customers observed very
interesting behaviour on high-end HT-enabled hardware. They noticed that
in some cases when high load is applied SQL Server CPU usage increases
significantly but SQL Server performance degrades.' Another developer,
this time from Citrix, was just as blunt. 'It's ironic. Intel had sold
hyperthreading as something that gave performance gains to heavily
threaded software. SQL Server is very thread-intensive, but it suffers.
In fact, I've never seen performance improvement on server software with
hyperthreading enabled. We recommend customers disable it.'"
cw
/
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