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

Tue Jan 12 00:26:31 PST 2016

Hi Ritesh,

On Tue, 2016-01-12 at 10:16 +0530, Ritesh Prajapati wrote:
> Hi Pavel,
> 
>     I have upgraded spice protocol to 0.12.10 and spice server to
> 0.12.6 which are latest and stable release into Ubuntu Host Machine
> on which spice server is running. Then, I have checked with older
> spice gtk version 0.22 with QUIC Image Decompression Method on my A20
> board which does not impact any on speed perspective.
> 
>     Now, I am planning to apply patch for LZ4 image
> compression/decompression support on my A20 board and will let you
> know the result as soon as possible.

If you cannot use spice-gtk v0.30, I would recommend you to first try
other compression methods - auto_glz, auto_lz, glz, lz, off
You can do it from the qemu commandline or using `virsh edit domain`

In order to use lz4 in 0.22 you would need to apply patches to spice-
gtk and also to the spice-common submodule. Look for patches
from Javier Celaya.

> 
> 
> Questions:-
> 
>     Do I need to add option like image-compression=lz4 to enable LZ4
> image compression/decompression method while running virtual
> manager(kvm) at spice server side? What is default image
> compression/decompression method in latest spice server 0.12.6 if we
> do not add any image-compression option while running virtual
> manager(kvm) on spice server side?

Unfortunately lz4 can be only enabled by the client, eg:
remote-viewer --spice-preferred-compression=lz4

I don't know how you manage virtual machines (virt-manager ?).
If it is by virsh, you can do
`virsh edit domain` and add eg <image compression='lz'/> node - 
see http://libvirt.org/formatdomain.html#elementsGraphics

The default value should be 'auto_glz' which selects from 'quic' and
'glz'.

Regards,
Pavel

> 
> Regards,
> Ritesh Prajapati,
> System Level Solutions (India) Pvt.Ltd.
> On Monday 11 January 2016 02:30 PM, Ritesh Prajapati wrote:
> > Hi Pavel, 
> > 
> >     Thanks for your quick reply. 
> > 
> >     I will try to upgrade SPICE GTK Firmware or apply patch of lz4
> > image compression/decompression support on my A20 SoC board and
> > SPICE Server 0.12.6 on my Ubuntu Host System. I will let you know
> > the result that it speeds up image decompression process or not
> > after testing it on my A20 board. 
> > 
> > Regards, 
> > Ritesh Prajapati, 
> > System Level Solutions (India) Pvt.Ltd. 
> > 
> > On Monday 11 January 2016 02:14 PM, Pavel Grunt wrote: 
> > > 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. 
> > > > _______________________________________________ 
> > > > Spice-devel mailing list 
> > > > Spice-devel at lists.freedesktop.org 
> > > > http://lists.freedesktop.org/mailman/listinfo/spice-devel 