Re: [Xen-devel] [PATCH] Add a timer mode that disables pending m

To:	Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>, Dave Winchell <dwinchell@xxxxxxxxxxxxxxx>
Subject:	Re: [Xen-devel] [PATCH] Add a timer mode that disables pending missed ticks
From:	Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date:	Wed, 07 Nov 2007 17:47:33 +0000
Cc:	"Shan, Haitao" <haitao.shan@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, "Dong, Eddie" <eddie.dong@xxxxxxxxx>, "Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx>
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On 7/11/07 17:29, "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx> wrote:

> So, you can see we send an interrupt immediately (and ASYNC) if any ticks
> have been missed, but then successive ticks are delivered 'on the beat'. A
> possible middleground? Or perhaps we should just go with SYNC after all...

How do these Linux x64 guests fare with the original and default timer mode,
by the way? I would expect that time should be accounted pretty accurately
in that mode, albeit with more interrupts than you'd like. Or is the lack of
synchronisation of TSCs across VCPUs causing issues that you're trying to
avoid?

 -- Keir

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