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Re: [Xen-devel] [PATCH] LAPIC timer accounting fix
| To: | Ben Guthro <bguthro@xxxxxxxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Gary Grebus <ggrebus@xxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH] LAPIC timer accounting fix |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Thu, 25 Oct 2007 15:16:26 +0100 |
| Delivery-date: | Thu, 25 Oct 2007 07:17:22 -0700 |
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| In-reply-to: | <471FB557.9070406@xxxxxxxxxxxxxxx> |
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| Thread-index: | AcgXEaDR351PlYMEEdyb3gAX8io7RQ== |
| Thread-topic: | [Xen-devel] [PATCH] LAPIC timer accounting fix |
| User-agent: | Microsoft-Entourage/11.3.6.070618 |
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 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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