For the record I am running on SuSE with a pretty much stock kernel. Not to sound naïve, but is turning of HT something done in the bios?
Rob -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Bill Moran Sent: Friday, October 31, 2003 9:56 AM To: [EMAIL PROTECTED] Subject: Re: [PERFORM] Pg+Linux swap use 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 ---------------------------(end of broadcast)--------------------------- TIP 5: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faqs/FAQ.html ---------------------------(end of broadcast)--------------------------- TIP 5: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faqs/FAQ.html
