Just for an additional viewpoint.  I'm finishing up a project based on FreeBSD
and PostgreSQL.  The target server is a Dual 2.4G Intel machine.  I have tested
the application with hyperthreading enabled and disabled.  To all appearances,
enabling hyperthreading makes the box act like a quad, with the expected increase
in processing capability - _for_this_application_.

I have also heard the claims and seen the tests that show hyperthreading
occasionally decreasing performance.  I think in the end, you just have to
test your particular application to see how it reacts.

Rob Sell wrote:
Not being one to hijack threads, but I haven't heard of this performance hit
when using HT, I have what should all rights be a pretty fast server, dual
2.4 Xeons with HT 205gb raid 5 array, 1 gig of memory. And it is only 50% as
fast as my old server which was a dual AMD MP 1400's with a 45gb raid 5
array and 1gb of ram. I have read everything I could find on Pg performance
tweaked all the variables that were suggested and nothing. Which is why I
subscribed to this list, just been lurking so far but this caught my eye.


Rob

-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Andrew Sullivan
Sent: Friday, October 31, 2003 8:36 AM
To: [EMAIL PROTECTED]
Subject: Re: [PERFORM] Pg+Linux swap use

On Fri, Oct 31, 2003 at 12:03:59PM -0200, alexandre :: aldeia digital wrote:

Scott, Jeff and Shridhar:

1 GB RAM :)

The stock kernels are not the same, HyperThreading enabled. 80


Some people have reported that things actually slow down with HT
enabled.  Have you tried turning it off?

A



--
Bill Moran
Potential Technologies
http://www.potentialtech.com


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