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Date: Wed, 2 Sep 2009 08:31:24 -0300 From: Glauber Costa <glommer@...hat.com> To: Chris Lalancette <clalance@...hat.com> Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org, avi@...hat.com Subject: Re: [PATCH 2/2] add sysctl for kvm wallclock sync On Wed, Sep 02, 2009 at 08:54:37AM +0200, Chris Lalancette wrote: > Glauber Costa wrote: > > diff --git a/arch/x86/kernel/kvmclock.c b/arch/x86/kernel/kvmclock.c > > index fc409e9..3a4e1bd 100644 > > --- a/arch/x86/kernel/kvmclock.c > > +++ b/arch/x86/kernel/kvmclock.c > > @@ -27,7 +27,7 @@ > > #define KVM_SCALE 22 > > > > static int kvmclock = 1; > > -static unsigned int kvm_wall_update_interval = 5; > > +unsigned int kvm_wall_update_interval = 5; > > I think the overall idea is very interesting, but I also think that it should be > disabled by default. Because of the problems with time in virtualization, > people are already conditioned to run ntpd inside their guests, and this > kvmclock change will "fight" with ntpd. Also, the command "# date 09091323" (or > whatever) ceases to work like it does on bare-metal, so I think it has to be an > opt-in feature. I don't disagree. Actually, I thought about that myself a few hours after I sent the patch. Avi, do you have a word on that ? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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