From: Robert Love <rml@tech9.net>
To: Jeff Chua <jchua@fedex.com>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: bug 2 cpus shows as 4 cpus
Date: 08 Oct 2002 19:57:08 -0400 [thread overview]
Message-ID: <1034121428.29468.1876.camel@phantasy> (raw)
In-Reply-To: <Pine.LNX.4.42.0210090733280.367-100000@silk.corp.fedex.com>
On Tue, 2002-10-08 at 19:39, Jeff Chua wrote:
> I'm running 2.4.20-pre9 on DELL server with Xeon dual processors, but
> /proc/cpuinfo shows not 2, but "4" cpus!
>
> The bogomips semms to indicate 2 cpus. (3971.48 is about 2GHz x 2).
>
> Is this problem related to Xeon? I've other SMP boxes with P3, but they
> reports correctly 2 cpus.
Hahaha, dude, you have hyper-threading! Each of your Xeons has two
logical processors that share most processor resources but implement two
independent pipelines. So you have four schedulable processors in
total.
Google around for hyper-threading, HT, and SMT. It is in all P4-class
Xeons and soon all regular P4s.
Robert Love
next prev parent reply other threads:[~2002-10-08 23:51 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-08 23:39 Jeff Chua
2002-10-08 23:52 ` Dave Jones
2002-10-08 23:57 ` Robert Love [this message]
2002-10-09 0:55 ` David S. Miller
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