RE: [PATCH] hyper-threading information in /proc/cpuinfo

From: Nakajima, Jun (jun.nakajima@intel.com)
Date: Fri Oct 25 2002 - 20:58:37 EST

I mean what you were referring to is called Chip-Multiprocessor (CMP),
architecturally. And probably, this is the cause of the confusion in the
discussions.

SMT is an orthogonal to it, and it is an established notion. You can have
SMT CMP, for example. So using "thread" for the cores in CMP is not proper
wording. It sounds something like "core" to me.

In my mind, the processor hierarchy looks like:
        node
        package (chip die)
        core
        thread

Jun
-----Original Message-----
From: Nakajima, Jun
Sent: Friday, October 25, 2002 5:54 PM
To: 'Rik van Riel'; Alan Cox
Cc: Nakajima, Jun; Robert Love; 'Dave Jones'; 'akpm@digeo.com';
'linux-kernel@vger.kernel.org'; 'chrisl@vmware.com'; 'Martin J. Bligh'
Subject: RE: [PATCH] hyper-threading information in /proc/cpuinfo

I don't understand. HT is one implementaion of (true) SMT.

Thanks,
Jun

-----Original Message-----
From: Rik van Riel [mailto:riel@conectiva.com.br]
Sent: Friday, October 25, 2002 5:49 PM
To: Alan Cox
Cc: Nakajima, Jun; Robert Love; 'Dave Jones'; 'akpm@digeo.com';
'linux-kernel@vger.kernel.org'; 'chrisl@vmware.com'; 'Martin J. Bligh'
Subject: RE: [PATCH] hyper-threading information in /proc/cpuinfo

On 25 Oct 2002, Alan Cox wrote:
> On Fri, 2002-10-25 at 22:50, Nakajima, Jun wrote:

> > Can you please change "siblings\t" to "threads\t\t". SuSE 8.1, for
example,
> > is already doing it:

> Im just wondering what we would then use to describe a true multiple cpu
> on a die x86. Im curious what the powerpc people think since they have
> this kind of stuff - is there a generic terminology they prefer ?

Agreed. Siblings is probably best for HT stuff and threads
are probably best reserved for true SMT CPUs.

Then there's the SMP-on-a-chip, but we should probably just
call those CPUs.

regards,

Rik 

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