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Date: Sat, 16 Mar 2002 11:40:25 -0800
From: Greg KH <greg@kroah.com>
To: Gordon J Lee <gordonl@world.std.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: IBM x360 2.2.x boot failure, 2.4.9 works fine
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On Sat, Mar 16, 2002 at 12:53:23PM -0500, Gordon J Lee wrote:
> > > 2.4.18  shows two processors
> > > 2.4.19-pre3 shows two processors
> > > 2.4.19-pre3-ac1 shows four processors
> >
> > Great, thanks for testing.  I'd recommend using this hardware :)

Sorry, I meant to say, "I'd recommend using this kernel version".

> From your earlier post, I presume that the bug here was simply a presentation
> layer bug in /proc/cpuinfo, and that kernel versions previous to 2.4.19-pre3-ac1
> can actually use all of the logical processors.  Is this correct ?

No, the other processors are not recognized by Linux at all.  You need
that kernel version to properly use all of the logical processors.

> If so, at which 2.4.x kernel did support for hyperthreading show up?

In one of the 2.4.19-ac kernels from what I remember, sorry I don't know
the exact version.

Hope this helps,

greg k-h
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