From: James Schmidt <james@JamesSchmidt.Com>
To: linux-kernel@vger.kernel.org
Subject: Re: broken maxcpus in 2.4.24
Date: Tue, 3 Feb 2004 17:45:25 -0600 (CST) [thread overview]
Message-ID: <20040203150930.W17910@speedy.insekure.com> (raw)
In-Reply-To: <1075765034.17943.79.camel@reactor.us.proofpoint.com>
Hope this hasn't been posted already.
Not sure if I am right or not on this but this seems to be related, at
least on my box, to the APIC IDs of the CPUs. I am using an Intel
SE7500CW, populated with 2x XEONs. The APIC ID's of the CPUs are 0 & 1
for the first physical CPU, and 6 & 7 for the second physical CPU (don't
ask me why). If I don't use NR_CPUs = 8, I don't seem to see the second
physical CPU. Someone correct me if I'm wrong.
-James
On Mon, 2 Feb 2004, Dan Christian wrote:
> I compiled a vanilla 2.4.24 for a 2 processor Xeon.
>
> I set CONFIG_NR_CPUS to 4 (2 CPUs x 2 hyperthreads each).
>
> When I boot the kernel, /proc/cpuinfo only shows 2 cpus (0-1) and
> performance is bad.
>
> I reconfigure CONFIG_NR_CPUS back to 32. Now it shows 4 cpus (0-3) and
> performance is normal.
>
> Is this a bug or am misunderstanding how to set this configuration
> variable?
>
> -Dan Christian
>
next prev parent reply other threads:[~2004-02-03 23:38 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-02-02 23:37 Dan Christian
2004-02-03 8:53 ` Marc-Christian Petersen
2004-02-03 23:45 ` James Schmidt [this message]
2004-02-03 23:49 ` Dave Jones
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