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

[Pavel Grunt]

Hi,

On Mon, 2016-01-11 at 12:17 +0530, Ritesh Prajapati wrote:
> Hi,
> 
> Currently, I am working and porting Android Kitkat 4.4.2 on All-
> winner A20 Soc board with following hardware and software details.
> A20 Allwinner SoC
> 1 GB RAM
> 8 GB NAND MMC
> Linux Kernel Version 3.4.39
> Malli 400 GPU
> Android Kitkat Version 4.4.2
> SPICE GTK Version 0.22

This is 2 years old, please try something more recent. There were some
updates to image compression like the lz4 image compression support
(v0.27), the ability to change the compression from the client (v0.30).
These improvements require the spice server v0.12.6.
> 
> I have configured and installed Linux Virtual Manager in one Ubuntu
> Desktop 14.04 Linux System to configure and run SPICE Server on it.
> Then, I have developed one Android based application which is used to
> configure SPICE Client settings and to start SPICE Client for
> connecting with SPICE Server which is running on Ubuntu Desktop
> System.
> 
> After connecting to SPICE Server from SPICE Client, I have started
> one video sample which is stored in Ubuntu Desktop System on which
> SPICE Server is running. 
> 
> Now, The issue is that the Video Sample which is streamed on A20
> board is too much slow compare to playing it in normal mode using
> video player.
> 
> So, I have tried to debug SPICE Client code on A20 board and found
> that it takes around 300 to 400 millisecond in
> QUIC_UNCOMPRESS_RGB(prefix, type) with prefix as 32 and type is RGB32
> to uncompress and decode one display frame which is coming from SPICE
> Server.
> 
> 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'

Regards,
Pavel
> 
> 
> -- 
> Regards,
> Ritesh Prajapati,
> System Level Solutions (India) Pvt.Ltd.
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