Re: HEADSUP: New i386 interrupt and SMP code..

From: John Baldwin (jhb_at_FreeBSD.org)
Date: 10/31/03

  • Next message: John Baldwin: "Re: HEADSUP: New i386 interrupt and SMP code.." 
    Date: Fri, 31 Oct 2003 10:20:34 -0500 (EST)
To: Brooks Davis <brooks@one-eyed-alien.net>

    On 30-Oct-2003 Brooks Davis wrote:
    > On Thu, Oct 30, 2003 at 05:34:47PM -0500, John Baldwin wrote:
    >> - The ACPI MADT table can be used to enumerate CPUs instead of
    >> the MP Table if ACPI is enabled. This will add true HT support
    >> in that we will finally support the BIOS setting for HT.
    >
    > Will there be an option to ignore the BIOS and do something like the
    > current system? I'm all for paying attention to the BIOS, but I've got
    > over 75 Xeons in my cluster and if they have the wrong BIOS settings,
    > this is going to hurt when we switch to 5.x.

    It's actually not safe to ignore the BIOS. We have one 750x based
    system here at work that doesn't boot a 4.x kernel with HTT enabled
    (the logical CPUs don't ack the IPI) unless HTT is also enabled in
    the BIOS.

    > Overall, I'm looking forward to this change. The death of the SMP
    > kernel is something I've been looking forward to for a long time.

    It was a question asked of Jordan at the first Usenix BSD BoF I
    attended back in 2000 in San Diego. :) 

    -- 
John Baldwin <jhb@FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve!"  -  http://www.FreeBSD.org/
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