* Detection of HyperThreading
@ 2011-05-02 3:47 Pieter De Wit
2011-05-02 16:15 ` Dave Jones
0 siblings, 1 reply; 2+ messages in thread
From: Pieter De Wit @ 2011-05-02 3:47 UTC (permalink / raw)
To: cpufreq
Hello Guys,
I found something quite weird over the weekend. I have a few machines that
claim they have HT (using cat /proc/cpuinfo). These machines doesn't
really support HT (both with the number of threads and Intel's website)
I was wondering:
a) Is this the right list to send to (Sorry if not)
and
b) How is the HT flag detected ?
CPU's like the Core2 Duo E6300 doesn't have HT, but yet the flag is
displayed ? See http://ark.intel.com/Product.aspx?id=27248 for info. I can
send a dump of /proc/cpuinfo later from home.
Thanks,
Pieter
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Detection of HyperThreading
2011-05-02 3:47 Detection of HyperThreading Pieter De Wit
@ 2011-05-02 16:15 ` Dave Jones
0 siblings, 0 replies; 2+ messages in thread
From: Dave Jones @ 2011-05-02 16:15 UTC (permalink / raw)
To: Pieter De Wit; +Cc: cpufreq
On Mon, May 02, 2011 at 03:47:30PM +1200, Pieter De Wit wrote:
> Hello Guys,
>
> I found something quite weird over the weekend. I have a few machines that
> claim they have HT (using cat /proc/cpuinfo). These machines doesn't
> really support HT (both with the number of threads and Intel's website)
>
> I was wondering:
>
> a) Is this the right list to send to (Sorry if not)
no, this list is for cpu frequency scaling. linux-kernel would have been
more appropriate.
> and
>
> b) How is the HT flag detected ?
>
> CPU's like the Core2 Duo E6300 doesn't have HT, but yet the flag is
> displayed ? See http://ark.intel.com/Product.aspx?id=27248 for info. I can
> send a dump of /proc/cpuinfo later from home.
the 'ht' flag in /proc/cpuinfo means "this cpu knows how to report how
many siblings it has". On a CPU which doesn't have hyperthreading, that
number will be 0.
Dave
^ permalink raw reply [flat|nested] 2+ messages in thread
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2011-05-02 3:47 Detection of HyperThreading Pieter De Wit
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