Question about CPU flags detection

Question about CPU flags detection

[hutuworm]

Hi all,

I just installed Red Hat Enterprise Linux AS release 4 (Nahant Update
4) on a Dell PE1950 server, which has two of dual-core Xeon 5110
1.6GHz CPUs. According to the processor spec @
http://processorfinder.intel.com/details.aspx?sSpec=SL9RZ , it doesn't
support Hyper-threading technology, but both 'cat /proc/cpuinfo | grep
' and 'dmidecode | grep -A 30 Flags' commands show there're "ht" or
"HTT (Hyper-threading technology)" available.

I think it should be kernel level's problem, is there anyone to
explain it please?

Thank you.

Liang Feng

-- 
In doG We Trust

Re: Question about CPU flags detection

[Arjan van de Ven]

On Fri, 2007-03-23 at 18:04 +0800, hutuworm wrote:
> Hi all,
> 
> I just installed Red Hat Enterprise Linux AS release 4 (Nahant Update
> 4) on a Dell PE1950 server, which has two of dual-core Xeon 5110
> 1.6GHz CPUs. According to the processor spec @
> http://processorfinder.intel.com/details.aspx?sSpec=SL9RZ , it doesn't
> support Hyper-threading technology, but both 'cat /proc/cpuinfo | grep
> ' and 'dmidecode | grep -A 30 Flags' commands show there're "ht" or
> "HTT (Hyper-threading technology)" available.


the "ht" flag there ONLY means "we support reporting the number of
threads/cores/etc via the MSRs". It does not mean that you actually have
hyperthreading, only that your cpu knows how to report what it
supports...


I hope this answer helps,
   Arjan van de Ven