linux-kernel - Re: ht CPU flag

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Message-ID: <464DF467.8080108@zytor.com>
Date:	Fri, 18 May 2007 11:45:59 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Bernd Eckenfels <ecki@...a.inka.de>
CC:	linux-kernel@...r.kernel.org
Subject: Re: ht CPU flag

Bernd Eckenfels wrote:
> In article <Pine.LNX.4.64.0705182131030.25685@...armcci.am> you wrote:
>> I have Pentium D CPU, which many Windows utilities like cpuz, wcpuid, 
>> everest identify as D 930 (Dual Core, 3GHz). From Intel site I find out 
>> that it has no HT feature, nor Windows XP identify it as HT.
> 
> the ht flag reported by the CPU and cpuinfo is not a reliable detection if
> HT is available on your CPU or your motherboard/bios.
> 
>> Why do I have "ht" flag in cpuinfo?
> 
> Because your CPU reports it. You will see that also in cpuz output.
> 
> However, you can see ht in the sibblings value (for a single core it will be
> 2 if you have HT, I am not sure if it is 4 for a dual core CPU)

IIRC, the HT flag is also reported for multicore CPUs.

	-hpa
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