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Re: [Qemu-devel] [PATCH v2 3/5] migration: do explicit incoming setup fo

From: Dr. David Alan Gilbert
Subject: Re: [Qemu-devel] [PATCH v2 3/5] migration: do explicit incoming setup for rdma
Date: Wed, 27 Jun 2018 15:13:04 +0100
User-agent: Mutt/1.10.0 (2018-05-17)

* Peter Xu (address@hidden) wrote:
> On Wed, Jun 27, 2018 at 01:25:45PM +0100, Dr. David Alan Gilbert wrote:
> > * Peter Xu (address@hidden) wrote:
> > > RDMA does not support postcopy recovery, so no need to go into such
> > > logic.  Instead of calling migration_fd_process_incoming(), let's call
> > > the two functions that setup the incoming migration.  There should have
> > > no functional change at all.
> > 
> > Can you explain why we need to though?  The reason I ask is that there
> > is Lidong Chen's work that gets postcopy partially working with RDMA, so
> > then the next question is bound to be recovery.
> Ah if so this patch needs to change.  Could you paste me the message
> id of the work?  Or link?
> After all I'll need to keep this bit, but I am just curious about what
> is "partially" mean here. :)


It enables postcopy with RDMA, but once it switches into postcopy mode
it doesn't use the fast features of RDMA, it still shuffles the data
as a stream (using some more basic RDMA features).


> Thanks,
> -- 
> Peter Xu
Dr. David Alan Gilbert / address@hidden / Manchester, UK

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