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RE: [Xen-devel] Rate adaption during live migration

To: "Daniel Stodden" <stodden@xxxxxxxxxx>, "Xen Developers" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-devel] Rate adaption during live migration
From: "Ian Pratt" <Ian.Pratt@xxxxxxxxxxxx>
Date: Sun, 14 Oct 2007 21:54:53 +0100
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Thread-index: AcgNJBNmWLUrnk0sRsuO4uIhpjzC6gBeiTWw
Thread-topic: [Xen-devel] Rate adaption during live migration
> I always thought adaptive transmission rates in live migration were
> switched on by default. Now I notice this does not seem to even be the
> case.
> 
> Is there any specific reason? Just because I'm interested. Won't work?

It certainly used to work, and I can't think of any reason why it would have 
bit rotted. 

> More importantly: Regarding the behavior when turned off, this turns
> off > RATE_IS_MAX() as well. Have been playing with totally pathetic cases
> and was surprised to learn that the present configuration would happily
> exercise them through maximum number of iterations. Is this
> intentional?

Yep, it goes flat out if the rate limiting is disabled.

Ian

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