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[Xen-devel] Re: [PATCH] Align periodic vpts

To: "Tian, Kevin" <kevin.tian@xxxxxxxxx>, "Wei, Gang" <gang.wei@xxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: [Xen-devel] Re: [PATCH] Align periodic vpts
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Wed, 11 Feb 2009 13:05:57 +0000
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On 11/02/2009 12:00, "Tian, Kevin" <kevin.tian@xxxxxxxxx> wrote:

> Think it more, I think that Jimmy's patch is simpler and more
> accurate for the purpose. It's just a one-time adjustment for
> periodical timer, and no harm to single-shot timer. It can be
> enabled by default, while per-domain range has side-effect
> unless adding more code to differentiate timers which is not
> worthy. 
> 
> Of course per-domain switch is still required to disable it as
> your previous comment, for old guest.

I'd actually be interested in knowing how just bumping Xen cmdline option
timer_slop= would influence power usage and guest timers. No new code
needed, a nice sliding dial (per host) for power usage versus timer
accuracy.

 -- Keir



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