Re: [Xen-devel] Re: improving VNC performance

[Paolo Bonzini <pbonzini@xxxxxxxxxx>]

On 07/26/2011 10:27 AM, Tim Deegan wrote:
> At 08:45 +0200 on 26 Jul (1311669952), Paolo Bonzini wrote:
> > On 07/26/2011 04:00 AM, James Harper wrote:
> > > It would be really nice to be able to cut&paste (would require a
> > > userspace app), and to fake some accelerator functions (eg block moves).
> > Block moves are accelerated if you use the Cirrus VGA.  Nothing else is,
> > though. :)
> Actually we found that it's faster to turn that acceleration off, since
> it's not really accelerated --- it'll be a memcpy either in domU or in
> qemu, and you might as well skip the (slow, synchronous) emulated
> register writes that domU would use to drive the blitter.
Yes, it's slower but saves bandwidth.  It depends on your use case.

Paolo


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