Re: [Qemu-devel] [PATCH 00/21][RFC] postcopy live migration

[Isaku Yamahata <yamahata@valinux.co.jp>]

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