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Date: Tue, 13 Nov 2012 19:09:19 +0200
From: Orit Wasserman <owasserm@redhat.com>
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Subject: Re: [Qemu-devel] Migration ToDo list
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To: Paolo Bonzini <pbonzini@redhat.com>
Cc: quintela@redhat.com, Michael Roth <mdroth@linux.vnet.ibm.com>, qemu-devel qemu-devel <qemu-devel@nongnu.org>, Isaku Yamahata <yamahata@valinux.co.jp>, benoit.hudzia@sap.com, chegu_vinod@hp.com

On 11/13/2012 06:28 PM, Paolo Bonzini wrote:
> Il 13/11/2012 17:18, Juan Quintela ha scritto:
>> Migration Thread
>> * Plan is integrate it as one of first thing in December (me)
> 
> Please make sure to take a look at the latest reviews I sent.
> 
>> * Remove copies with buffered file (me)
> 
> I also have some prototype of this.
> 
>> RDMA
>> * Send RDMA/tcp/.... library they already have (Benoit)
>> * This is required for postcopy
>> * This can be used for precopy
> 
> * Investigate RDS (Reliable Datagram Socket, which work on top of both
> TCP and InfiniBand/RDMA.
> 
>> General
>> * Change protocol to:
>>   a) being always 16byte aligned (paolo said that is faster)
> 
> Well, it's faster with the buffers.  Hopefully they go away and we do
> not have the problem.
> 
>>   b) do scatter/gather of the pages?
I would prefer to postpone changing the protocol and start with using iov (writev)
for sending the pages (still sending header and than the page). Later we can 
move to scatter/gather I'm not sure of how large the performance gain will be.
> 
> c) Remove compression of non-zero repetitive pages.
+1
we can look of identify the zero pages without calling is_dup_page which looks
expensive.

Orit
> 
> All of the above, I'd say.
> 
> Paolo
>