Re: [Xen-devel] [PATCH] LAPIC timer accounting fix

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 24/10/07 22:12, "Ben Guthro" <bguthro@xxxxxxxxxxxxxxx> wrote:

> Offset emulated local APIC timer so it doesn't tick during guest's
> timer related processing. Otherwise, guests using the local APIC for
> process accounting can see long sequences of process ticks incorrectly
> charged to interrupt processing.

Do they really get in sync like that? Seems a bit odd. Couldn't the same
happen on real hardware? I wonder why it would be more likely in the
virtualised case...

Perhaps just offsetting all periodic timers by some random fraction of the
period would be a simpler patch?

 -- Keir



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