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Message-ID: <4769505C.5020309@qumranet.com> Date: Wed, 19 Dec 2007 19:09:48 +0200 From: Avi Kivity <avi@...ranet.com> To: dor.laor@...ranet.com CC: Amit Shah <amit.shah@...ranet.com>, kvm-devel@...ts.sourceforge.net, linux-kernel <linux-kernel@...r.kernel.org>, Avi Kivity <avi@...o.co.il>, Gerd Hoffmann <kraxel@...hat.com> Subject: Re: [kvm-devel] Guest kernel hangs in smp kvm for older kernelsprior to tsc sync cleanup Dor Laor wrote: >> > > >> > > vmx (and svm) allow us to add an offset to the physical tsc. We >> set it >> > > on startup to -tsc (so that an rdtsc on boot would return 0), and >> > > massage it on vcpu migration so that guest rdtsc is monotonic. >> > > >> > > The net effect is that tsc on a vcpu can experience large forward >> jumps >> > > and changes in rate, but no negative jumps. >> > >> > Changes in rate does not sound good. It's possibly what's screwing up >> > my paravirt clock implementation in smp. >> >> Do you mean in the case of VM migration, or just starting them on a >> single >> host? >> > It's the cpu preemption stuff on local host and not VM migration No, migrating a vcpu to another cpu. -- error compiling committee.c: too many arguments to function -- 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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