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From: Juan Quintela <quintela@redhat.com>
In-Reply-To: <1383748635.1739.92.camel@nilsson.home.kraxel.org> (Gerd
	Hoffmann's message of "Wed, 06 Nov 2013 15:37:15 +0100")
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Date: Wed, 06 Nov 2013 16:38:21 +0100
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Subject: Re: [Qemu-devel] [PATCH v2 00/39] bitmap handling optimization
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To: Gerd Hoffmann <kraxel@redhat.com>
Cc: chegu_vinod@hp.com, qemu-devel@nongnu.org

Gerd Hoffmann <kraxel@redhat.com> wrote:
>   Hi,
>
>> - vga ram by default is not aligned in a page number multiple of 64,
>> 
>>   it could be optimized.  Kraxel?  It syncs the kvm bitmap at least 1
>>   a second or so? bitmap is only 2048 pages (16MB by default).
>>   We need to change the ram_addr only
>
> It is created using memory_region_init_ram(), in vga_common_init().
> Nothing special is done to avoid/force any alignment.
> Dunno why it ends up on a odd page number.
>
>> - vga: still more, after we finish migration, vga code continues
>>   synchronizing the kvm bitmap on source machine.  Notice that there
>>   is no graphics client connected to the VGA.  Worth investigating?
>
> Yep, needed to figure updated screen areas.  It never stops completely,
> but the refresh rate should be alot lower with no vnc client connected,
> something like once every few seconds without client vs. 30x per second
> with client.

When the guest is stopped you really need to ask kvm for changes?
strange,  no?

Later,  Juan.