Hyperthreading/Dual core CPU's

[Rhugga Harper]

I would disable hyper-threading. We have 24k+ hosts (Mostly 2650's and
2850's) and saw nothing but problems with hyperthreading on nearly every
distro: RH AS 2.1, 3 and SLES 9. In many cases it actually inhibited
performance. There is a very small niche of applications that can benefit
from hyperthreading. (Our hosts are mostly oracle rac's, application
servers, and other various middle-tier applications) Note that the problems
with hyper-threading surface under heavy enterprise loads, which of course
is where you would need it.

Go with AMD and their HypeTransport / dual-core. Much better performance
accross the boards IMHO.

-rhugga




On 11/11/05, Mike Ault <mike at ault.cc> wrote:
>
> As long as you load the SMP version it should see them. If not there is a
> relink option to turn on hyperthreading for the CPUs.
>
> Mike
>
> -----Original Message-----
> From: redhat-list-bounces at redhat.com [mailto:
> redhat-list-bounces at redhat.com]
> On Behalf Of Robert
> Sent: Friday, November 11, 2005 10:13 AM
> To: redhat-list at redhat.com
> Subject: Hyperthreading/Dual core CPU's
>
> Hi list,
> We have plans to buy HP DL380's and put Redhat AS 4.0, anyone know how the
> Hyperthreading works on Redhat, can we enable it on Redhat? does it see 2
> CPU's if there is only one CPU board?.
> In Windows 2003 we have enabled Hyperthreading and OS sees 4 CPU's (2 CPU
> boards).
> Thanks in advance
>
>
>
>
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