Messages in this thread | | | Date | Mon, 2 May 2011 11:04:22 +0300 | From | Gleb Natapov <> | Subject | Re: [patch 0/2] x2apic optimization, round 4 |
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On Mon, May 02, 2011 at 11:52:26AM +0400, Cyrill Gorcunov wrote: > On 05/02/2011 11:45 AM, Gleb Natapov wrote: > > On Mon, May 02, 2011 at 11:09:16AM +0400, Cyrill Gorcunov wrote: > >> On 05/02/2011 09:51 AM, Cyrill Gorcunov wrote: > >>> Yeah, i'll do so as only bring my laptop to life, I managed to kill > >>> grub and can't restore it back for a while, will ping you back as soon > >>> as I can. > >>> > >>> Sorry for top post. > >>> > >> > >> I've managed to semi-restore it. Gleb, maybe there some additional > >> parameter needed for kvm (except -cpu host,+x2apic) to make it work > >> with cluster mode? I always see physical mode which was not the target > >> of the patch series. > >> > > Hmm, +x2apic is enough to advertise x2apic presents to the OS. What > > logic Linux uses to decide which mode to use? > > > > -- > > Gleb. > > As far as I know interrupt remapping should be supported by kernel > to switch to logic cluster mode, so I presume kvm doesn't support > it yet and in result only physical mode is used. I think ACPI_SIG_DMAR > is missed in acpi tables (actually I didn't find it in kvm sources). > Ahh, definitely. I recall that now.
-- Gleb.
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