linux-kernel - Re: Question about CPU flags detection

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Message-Id: <1174649140.1158.230.camel@laptopd505.fenrus.org>
Date:	Fri, 23 Mar 2007 12:25:40 +0100
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	hutuworm <hutuworm@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Question about CPU flags detection

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
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