[Fwd: HTT/SMP servers instability on 5.3-STABLE]

Colin J. Raven colin at kozy-kabin.nl
Fri Dec 10 11:00:41 PST 2004

On Dec 10, Toomas Aas launched this into the bitstream:

> Colin J. Raven wrote:
>> On Dec 10, Toomas Aas launched this into the bitstream:
>>> For more than a month now, I've been running a Dual Xeon 2000 system (IBM 
>>> eServer xSeries 225) with 5.3-RC2 and later upgraded to 5.3-RELEASE and I 
>>> have no problems at all. Hyperthreading is disabled in BIOS, ACPI is 
>>> enabled.
>> Excuse me for jumping into this thread but could you elaborate as to why 
>> you have Nyperthreading disabled? 
> I'm afraid I can't give you any good technical reasons. I simply think of HTT 
> as Intel marketing blurb, meant to make you feel like you are getting two 
> CPUs for the price of one. Well, actually it's still only one CPU. I've been 
> running another single Xeon 2.4 box for more than a year. Initially, I ran 
> several months with HTT enabled. Then I ran several months with HTT disabled. 
> I didn't really notice any performance difference.

Well thanks for sharing those observations. Until I read what you said I 
*assumed* that there was a performance difference with HTT 
enabled. The specs seem to show that there *is* a theoretical 
difference, yet clearly according to your observations there just isn't 
any difference of earth shaking proportions.

Much appreciated!

Colin J. Raven
NetBSD on a Cobalt Qube2 - http://www.NetBSD.org - 
Fri Dec 10 19:56:00 UTC 2004
  7:56PM  up  4:09, 5 users, load averages: 1.11, 1.16, 1.16

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