Date: Fri, 30 Nov 2007 17:15:11 +0100 From: Kris Kennaway <kris@FreeBSD.org> To: Ivan Voras <ivoras@freebsd.org> Cc: freebsd-stable@freebsd.org Subject: Re: Also seeing 2 x quad-core system slower that 2 x dual core Message-ID: <4750370F.80806@FreeBSD.org> In-Reply-To: <fipa1s$ppu$1@ger.gmane.org> References: <200711291932.05614.max@love2party.net> <E1IxtQS-000Kfz-I2@dilbert.ticketswitch.com> <b41c75520711292059p5688a0ebled44d5b81694f539@mail.gmail.com> <474FD17D.7080209@FreeBSD.org> <fipa1s$ppu$1@ger.gmane.org>
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Ivan Voras wrote: > Kris Kennaway wrote: > >> Check dmesg for the APIC numbers corresponding to the CPUs you want to >> disable and add the corresponding entries to /boot/loader.conf, e.g.: >> >> hint.lapic.1.disable="1" >> hint.lapic.3.disable="1" >> hint.lapic.5.disable="1" >> hint.lapic.7.disable="1" > > Hi, > > Do you know how his method compares to setting machdep.hlt_cpus ? That is not supported with ULE (and will lead to deadlocks), but I don't know off-hand if hyperthreading virtual CPUs have their own apic...ok, it does on one of my systems at least, so that is probably the way to go when possible. Krishome | help
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