Re: [Qemu-devel] [PATCH v2 00/39] bitmap handling optimization

[Juan Quintela <quintela@redhat.com>]

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.