On 6/6/07 12:00, "Jan Beulich" <[EMAIL PROTECTED]> wrote: >> If the error across CPUS is +/- just a few microseconds at worst then having >> the clocksource clamp to no less than the last timestamp returned seems a >> reasonable fix. Time won't 'stop' for longer than the cross-CPU error, and >> that should always be a tiny value. > > Are you sure this is also true when e.g. a CPU gets throttled due to thermal > conditions? It is my understanding that both the duty cycle adjustment and > the frequency reduction would yield a reduced rate TSC, which would be > accounted for only the next time the local clock gets calibrated. Otherwise, > immediate calibration (and vcpu update) would need to be forced out of the > thermal interrupt. Yes, this could be an issue. Is there any way to get an interrupt or MCE when thermal throttling occurs? -- Keir _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linux-foundation.org/mailman/listinfo/virtualization
- [patch 04/33] xen: paravirt: unstatic leave_mm Jeremy Fitzhardinge
- [patch 01/33] xen: paravirt: add an "mm" arg... Jeremy Fitzhardinge
- [patch 02/33] xen: paravirt: add a hook for once the a... Jeremy Fitzhardinge
- [patch 03/33] xen: paravirt: increase IRQ limit Jeremy Fitzhardinge
- [patch 14/33] xen: xen time implementation Jeremy Fitzhardinge
- Re: [Xen-devel] [patch 14/33] xen: xen time imple... Jan Beulich
- Re: [Xen-devel] [patch 14/33] xen: xen time i... Keir Fraser
- Re: [Xen-devel] [patch 14/33] xen: xen ti... Jan Beulich
- Re: [Xen-devel] [patch 14/33] xen: xe... Keir Fraser
- Re: [Xen-devel] [patch 14/33] xe... Jan Beulich
- Re: [Xen-devel] [patch 14/33... Keir Fraser
- Re: [Xen-devel] [patch 14/33... Andi Kleen
- Re: [Xen-devel] [patch 14/33... Jan Beulich
- Re: [Xen-devel] [patch 14/33... Andi Kleen
- Re: [Xen-devel] [patch 14/33... Keir Fraser
- Re: [Xen-devel] [patch 14/33] xen: xen time i... Jeremy Fitzhardinge
- Re: [Xen-devel] [patch 14/33] xen: xen ti... Jan Beulich
- Re: [Xen-devel] [patch 14/33] xen: xen ti... Andi Kleen
- Re: [Xen-devel] [patch 14/33] xen: xe... Jeremy Fitzhardinge
- [patch 05/33] xen: paravirt: unstatic smp_store_cpu_in... Jeremy Fitzhardinge
- [patch 06/33] xen: paravirt: make siblingmap functions... Jeremy Fitzhardinge