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Re: [Xen-devel] [RFC] use event channel to improve suspend speed

To: Brendan Cully <brendan@xxxxxxxxx>
Subject: Re: [Xen-devel] [RFC] use event channel to improve suspend speed
From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date: Fri, 25 May 2007 07:46:40 +0100
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, "Daniel P. Berrange" <berrange@xxxxxxxxxx>
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On 25/5/07 01:06, "Brendan Cully" <brendan@xxxxxxxxx> wrote:

> In case there's interest, I'll attach the two patches I'm using to
> speed up checkpointing (and live migration downtime). As I mentioned
> earlier, the first patch should be semantically equivalent to existing
> code, and cuts downtime to about 30-35ms. The second notifies xend
> that the domain has been suspended asynchronously, so that final round
> memory copying may begin before device migration stage 2. This is a
> semantic change, but I can't think of a concrete drawback. It's a
> little rough-and-ready -- suggestions for improvement are welcome.

Can patch 2 be used without patch 1? The fact it doesn't need to change the
guest interface again is a big advantage. And it seems to provide by far the
larger proportional speedup.

 -- Keir

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