> From: Andrew Theurer [mailto:habanero@us.ibm.com]
> I would like to know if there is any way to confirm that I have
> hyperthreading enabled, and my P4 CPUs are hyperthreaded.
> Actually, from
> something like /proc/cpuinfo, I'd like to figure out if I am
> seeing 2/4
> physical/logical processors, as a result from hyperthreading, or 4/4
> physical/logical processors with no hyperthreading. I know,
> "If it's double
> the number of physical processors, well you have
> hyperthreading enabled."
> The problem is, I have 4 physical processors, but kernel.org
> kernels so far
> do not recognize all of them. 2.4.18 will find 3, while
> 2.5.11 will find
> only 2 (BIOS hyperthreading support off, no acpismp=force).
> However, on
> 2.5.11, if I enable hyperthreading (thru BIOS and
> acpismp=force, I see 4
> processors.
>
> I would very much like to believe that in this configuration,
> I am only
> running on 2 physical, 4 logical processors, but I am getting a 31%
> improvement (netbench) when hyperthreading is enabled. Thats
> why I want to
> confirm I am really only using 2 physical, 4 logical
> processors. Is there
> any way I can do this? (dmesg? /proc/cpuinfo?)
Well the two alternatives are, either A) turning on hyperthreading enabled
the two virtual processors or B) turning on hyperthreading somehow enabled
the other two processors, right?
I would think B would be highly unlikely.
Anyone else who actually has HT hardware care to comment? ;-)
Regards -- Andy
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This archive was generated by hypermail 2b29 : Tue Apr 30 2002 - 22:00:18 EST