Date: Fri, 31 Oct 2003 10:20:34 -0500 (EST) From: John Baldwin <jhb@FreeBSD.org> To: Brooks Davis <brooks@one-eyed-alien.net> Cc: arch@freebsd.org Subject: Re: HEADSUP: New i386 interrupt and SMP code.. Message-ID: <XFMail.20031031102034.jhb@FreeBSD.org> In-Reply-To: <20031030225346.GB5173@Odin.AC.HMC.Edu>
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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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