Re: Gentoo guest with smp: emerge freeze while recompile world

["Riccardo" <andrighetto.riccardo@gmail.com>]

---------- Original Message ----------- 
 From: Avi Kivity <avi@redhat.com> 
 To: Riccardo <andrighetto.riccardo@gmail.com> 
 Cc: kvm@vger.kernel.org 
 Sent: Sun, 23 May 2010 16:30:06 +0300 
 Subject: Re: Gentoo guest with smp: emerge freeze while recompile world

> On 05/23/2010 03:12 PM, Riccardo wrote: 
> > ---------- Original Message ----------- 
> >   From: Avi Kivity<avi@redhat.com> 
> >   To: Riccardo<andrighetto.riccardo@gmail.com> 
> >   Cc: kvm@vger.kernel.org 
> >   Sent: Sun, 23 May 2010 14:38:42 +0300 
> >   Subject: Re: Gentoo guest with smp: emerge freeze while recompile world 
> > 
> >     
> >> On 05/21/2010 07:47 PM, Riccardo wrote: 
> >>       
> >>>         
> >>>> If you are using kvm-clock, maybe try disabling that. 
> >>>> 
> >>>> 
> >>>>           
> >>> $ cat /sys/devices/system/clocksource/clocksource0/current_clocksource 
> >>> hpet 
> >>> 
> >>> This is from server, not from VM (that have freeze). 
> >>> 
> >>>         
> >> What about the guest? 
> >> 
> >> -- 
> >> error compiling committee.c: too many arguments to function 
> >>       
> > ------- End of Original Message ------- 
> > 
> > # dmesg | grep clock 
> > [    0.000000] kvm-clock: cpu 0, msr 0:1845bc1, boot clock 
> > [    0.000000] kvm-clock: cpu 0, msr 0:28047bc1, primary cpu clock 
> > [    0.000999] hpet clockevent registered 
> > [    0.084027] kvm-clock: cpu 1, msr 0:28063bc1, secondary cpu clock 
> > [    0.102059] kvm-clock: cpu 2, msr 0:2807fbc1, secondary cpu clock 
> > [    0.120035] kvm-clock: cpu 3, msr 0:2809bbc1, secondary cpu clock 
> > [    0.148051] kvm-clock: cpu 4, msr 0:280b7bc1, secondary cpu clock 
> > [    0.173039] kvm-clock: cpu 5, msr 0:280d3bc1, secondary cpu clock 
> > # cat /sys/devices/system/clocksource/clocksource0/current_clocksource 
> > kvm-clock 
> > # cat /sys/devices/system/clocksource/clocksource0/available_clocksource 
> > kvm-clock tsc hpet acpi_pm 
> > 
> >     
> 
> Please try with kvmclock disabled.

I have recompile gentoo-sources-2.6.34 without kvm-clock: 
# cat /sys/devices/system/clocksource/clocksource0/current_clocksource 
tsc 
# dmesg | grep clock 
[    0.000000] hpet clockevent registered 
[    0.661050] Switching to clocksource tsc

And with this kernel all working fine! (emerge -e world) 
It's a problem in the kvm-clock for kernel >=2.6.32

> > Do you think it's a related issue with the system freeze under compiling with 
> > newer kernel? 
> >     
> 
> That's what we're trying to find out. 
> 
Ok, It's only a simple question :) 
Thanks for your support and to Brian Jackson