[NTLUG:Discuss] 2 Xeons look like 4

[Cameron, Thomas]

> -----Original Message-----
> From: kbrannen at gte.net [mailto:kbrannen at gte.net]
> Sent: Tuesday, December 23, 2003 10:12 PM
> To: NTLUG Discussion List
> Subject: Re: [NTLUG:Discuss] 2 Xeons look like 4
> 
> 
> Thomas Cameron wrote:
> > ----- Original Message ----- 
> > From: "Bishop, Cass" <cbishop at atxna.com>
> > To: "'NTLUG Discussion List'" <discuss at ntlug.org>
> > Sent: Tuesday, December 23, 2003 1:02 PM
> > Subject: [NTLUG:Discuss] 2 Xeons look like 4
> > 
> > 
> > 
> >>I have 2 Intel Xeon processors in my server.  When I run 
> top it says there
> >>are 4 cpu's.  Any idea why?  I see this in RedHat 7.3 and RedHat
> > 
> > Enterprise
> > 
> >>Server 3.
> 
> > 
> > Welcome to the world of HyperThreading.  Basically each 
> physical processor
> > runs two virtual instances of itself, in theory giving the 
> computer more
> > oomf.  We use only HT procs at my job, and I love them.  It 
> seems to work
> > pretty darned well.
> 
> Hmm, you're having better luck than I then.  We tried it on 
> RH9.0 on a Compaq 
> DL380 (G3 model w/ dual Xeons) and I found weird stability 
> problems.  The 
> problems all went away when I turned off hyperthreading in the BIOS.
> 
> Kevin

Weird - we use DL380 and DL580 servers here at Bank of America, and they all run like scalded dogs with RHEL 2.1AS.

--
Thomas Cameron, RHCE, CNE, MCSE, MCT
Assistant Vice President
Linux Design and Engineering
Bank of America
(972) 997-9641

The opinions expressed in this message are mine alone and do not necessarily reflect the opinions of my employer, Bank of America.