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

[Ritesh Prajapati]

Hi Christophe,

     Do you know that by adding *"-mno-unaligned-access"* flag into 
CFLAGS of MakeFile will decrease time to decompress Image through QUIC 
method in our ARM based A20 SoC board? Does that flag will impact 
anything from performance perspective?

     Please let me know if you have any idea for that.

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

On Monday 11 January 2016 03:50 PM, Christophe Fergeau wrote:
> 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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