redhat 7.3 an PE 2650 indicate 4 Processors instead 2

James jfhall8 at
Wed Dec 18 12:45:00 CST 2002

Hyperthreading can decrease performance if OS and Application are not
written for HT processors. I would not run HT on an OS that does not
explicitly support it. 

-- Jim

"So here I go, it's my shot
Feet fail me not
This may be the only opportunity I got"

-----Original Message-----
From: linux-poweredge-admin at
[mailto:linux-poweredge-admin at] On Behalf Of jason andrade
Sent: Wednesday, December 18, 2002 5:16 AM
To: Shahram
Cc: Amit_Bhutani at; linux-poweredge at
Subject: Re: redhat 7.3 an PE 2650 indicate 4 Processors instead 2

On Wed, 18 Dec 2002, Shahram wrote:

> is this advantageous to run with Hyper-Threading on Redhat 7.3?

hyperthreading should give you an extra 25-40% of available cpu
on the application (multithreaded ? multiple applications?).

> is there any disadvantage known?

there hasn't been any feedback which talks about disadvantages at this
point but it is still a relatively new piece of technology in terms of
widespread deployment.  i am sure they will crop up.

there have been a couple of reports of people solving some stability
issues by disabling hyperthreading but they have not been conclusive.



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