[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Xen-devel] please revert c/s 17686

I checked in c/s 17844 to address this issue. We do not call
hpet_broadcast_init() and this now has the knock-on effect that we never use
state C3.

 -- Keir

On 12/6/08 14:28, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote:

> Switching HPET into legacy mode is not acceptable, as this doesn't only
> cut off the PIT channel 0 interrupt, but also the RTC one. The former is
> acceptable as no domain will ever gain control over it, but the latter isn't
> as Dom0 may validly make use of it. I'm observing a failure of setting the
> system clock correctly due to this issue (hwclock checks whether the RTC
> update interrupt is occurring as expected), and I suppose other uses of
> /dev/rtc would also suffer.
> It is my understanding that using the HPET to overcome the APIC timer
> stop issue is therefore impossible at present - you cannot use legacy
> mode, and you also cannot use the individual routing mode as whatever
> IRQ is chosen may turn out being in use by one or more other devices
> (and hence would require sharing the IRQ between Xen and one or more
> guests).
> Thanks, Jan
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel

Xen-devel mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.