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    SubjectRe: SMP processor rework help needed
    Date
    Yes it would however in my case, the cooler,which I can't get off, is too
    big for the first slot!

    It's just 1 more way linux can be more flexible with hardware.
    ----- Original Message -----
    From: "Gerhard Mack" <gmack@innerfire.net>
    To: "Andi Kleen" <ak@muc.de>
    Cc: "Tommy Faasen" <tommy@vuurwerk.nl>; <linux-kernel@vger.kernel.org>
    Sent: Sunday, October 14, 2001 10:50 PM
    Subject: Re: SMP processor rework help needed


    > On 14 Oct 2001, Andi Kleen wrote:
    >
    > > In article <000b01c154ee$1d6a2610$6400a8c0@it0>,
    > > "Tommy Faasen" <tommy@vuurwerk.nl> writes:
    > > > Hi,
    > > > I have this unique situation where cpu 1 has less features (like fxsr)
    then
    > > > cpu 0.
    > >
    > > I used to have such an AMP machine too: a dual PII-300 with one Katmai
    and one
    > > Deschutes. It's technically a violation of the specs; the Intel SMP spec
    > > requires that the non boot cpus need to have a superset of the features
    > > of the boot CPU. One CPU died, so it is symmetric now.
    > >
    > > For most capabilities it should already work in 2.4 after hpa's cpu
    > > set rewrite, but FXSAVE is unfortunately a bit of a special case because
    > > it is used in the scheduler context switch and that is required early
    > > in the initialization for SMP bootup and changing it would be very
    > > intrusive.
    > >
    > > In the 2.2 SuSE kernel it was fixed instead by adding a new kernel
    > > command line option nofxsave that overrides the FXSAVE bit on the first
    > > CPU. That is ok because such setup is very rare and is only generated by
    > > people who build their own boxes; and these should also know how to pass
    > > kernel command line arguments.
    >
    > This may sound like a dumb question but wouldn't simply swapping the CPUs
    > have the same affect?
    >
    > Gerhard
    >
    >
    >
    > --
    > Gerhard Mack
    >
    > gmack@innerfire.net
    >
    > <>< As a computer I find your faith in technology amusing.
    >
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