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Re: [Qemu-devel] [PATCH 00/21][RFC] postcopy live migration
From: |
Isaku Yamahata |
Subject: |
Re: [Qemu-devel] [PATCH 00/21][RFC] postcopy live migration |
Date: |
Wed, 4 Jan 2012 12:51:10 +0900 |
User-agent: |
Mutt/1.5.19 (2009-01-05) |
On Thu, Dec 29, 2011 at 04:39:52PM -0600, Anthony Liguori wrote:
>> TODO
>> ====
>> - benchmark/evaluation. Especially how async page fault affects the result.
>
> I'll review this series next week (Mike/Juan, please also review when you
> can).
>
> But we really need to think hard about whether this is the right thing to
> take into the tree. I worry a lot about the fact that we don't test
> pre-copy migration nearly enough and adding a second form just introduces
> more things to test.
>
> It's also not clear to me why post-copy is better. If you were going to
> sit down and explain to someone building a management tool when they
> should use pre-copy and when they should use post-copy, what would you
> tell them?
The concrete patch and its benchmark/evaluation result will help much for
making better discussion/decision (whatever decision we will make).
My answer is, follow the same policy for block device case.
It supports block migration/copy-on-read/image streaming/live block copy...
(some of them are under development, though)
Seriously, we'll learn the best practice through evaluation/making experiences.
thanks,
--
yamahata