[Spice-devel] QUIC Image Decompression Method takes much time

[Christophe Fergeau]

On Mon, Jan 11, 2016 at 09:44:38AM +0100, Pavel Grunt wrote:
> On Mon, 2016-01-11 at 12:17 +0530, Ritesh Prajapati wrote:
> > I have also observed that SPICE Client is using QUIC Image
> > decompression method to uncompress compressed Image Frame.
> > 
> > So, Does anyone has idea or solution to decrease time in QUIC Image
> > De-compression Method or any alternative De-compression Method which
> > is faster than QUIC Mode?
> 
> The fastest is without compression. You can try to change the
> compression in the qemu commandline using image-
> compression=[auto_glz|auto_lz|quic|glz|lz|off] and see what is the
> fastest on A20.
> 
> e.g.:
> qemu-kvm -spice port=5900,disable-ticketing,image-compression=off
> 
> Or if you use the latest spice server and spice-gtk you can change the
> image-compression from the client using its '--spice-preferred-
> compression'

There has also been reports of unaligned memory accesses on ARM slowing
things down a lot, maybe you are hitting this as well.
See the "aspeed: video frames pass-through" thread from last October,
which turned into "demarshall: Add safe method for unaligned byte
access." in November.

Christophe
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