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

[Uri Lublin]

On 01/11/2016 10:44 AM, 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

Also try enabling video streaming (regardless of the default)
qemu-kvm -spice port=5900,disable-ticketing,streaming-video=filter

Regards,
     Uri.