Messages in this thread | | | Date | Thu, 8 Jul 2010 08:31:00 +0300 | From | Gleb Natapov <> | Subject | Re: [patch 134/149] x86, paravirt: Add a global synchronization point for pvclock |
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On Wed, Jul 07, 2010 at 10:05:36PM +0200, Peter Palfrader wrote: > On Wed, 07 Jul 2010, Gleb Natapov wrote: > > > On Wed, Jul 07, 2010 at 04:33:39PM +0200, Peter Palfrader wrote: > > > On Wed, 07 Jul 2010, Glauber Costa wrote: > > > > > > > > 2.6.32.16 fails to boot on my KVM domains using qemu-kvm 0.11.1. > > > > > > > > > > Bisecting between 2.6.32.14 which worked and .16 turned up this commit > > > > > as the first culprit[0]. > > > > > > > > > > The host is still running 2.6.32.14 and has 8 cores on 2 CPUs. The > > > > > single-cpu KVM domain hangs just after printing 'Write protecting the > > > > > kernel read-only data: 9492k'[1]. On a successful boot this line would > > > > > usually be followed by 'INIT: version 2.86 booting'. > > > > > > > > > > A 2.6.32.16 with this patch reverted boots fine. > > > > > > > > > > If there's any info you need please just ask. > > > > > > > if you boot with another clocksource, and then switch to kvmclock with the machine already > > > > running, do you see anything strange or suspicious? > > > > > > Booting with various clocksource=xxx kernel parameters does not change > > > the behaviour at all, i.e. the boot still hangs. > > > > > And what if you provide -cpu qemu64,-kvmclock to qemu command line? > > Adding that to the glob of options that already were there from libvirt > didn't disable it, but using an LD_PRELOAD wrapper[1] to that purpose on > the host when starting kvm did help. > Strange. -kvmclock should have had the same effect. What qemu is it? What is your command line?
> Now, with kvmclock no longer being available at all the system picks tsc > and indeed boots 2.6.32.16 successfully. > > - Peter > 1. http://people.debian.org/~paravoid/kvm-noclock-3.tar.gz > -- > | .''`. ** Debian GNU/Linux ** > Peter Palfrader | : :' : The universal > http://www.palfrader.org/ | `. `' Operating System > | `- http://www.debian.org/
-- Gleb.
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