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

[Gerd Hoffmann]

  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.

cheers,
  Gerd