[Spice-devel] Delay in Gimp when using qxl driver

[Dominique Rodrigues]

Le 22/01/2012 15:46, Alon Levy a écrit :
> On Sun, Jan 22, 2012 at 03:18:14PM +0100, Dominique Rodrigues wrote:
>> Le 20/01/2012 20:04, Yaniv Kaul a écrit :
>>> ----- Original Message -----
>>>>> samples    pcnt    function        DSO
>>>>>
>>>>> 3796.00        60.4%    hashlittle
>>>> This sucks, unfortunately I don't have any quick fix for it. It's the
>>>> hash computation done on each image. Needless to say it needs to be
>>>> optimized - either made more efficient or reduce the number of calls.
>>>>
>>>> Soren, FYI.
>>> You could move to murmur2, like Windows' QXL driver (https://bugs.freedesktop.org/show_bug.cgi?id=37465) or murmur3 or other faster ones (https://bugs.freedesktop.org/show_bug.cgi?id=35775).
>>> At least it's not hashed twice now(https://bugs.freedesktop.org/show_bug.cgi?id=37977 - worth updating bug status?!), but I'm not sure it should be hashed at all, if it's not cached.
>>> Y.
>> That's true : when you draw in Gimp in a Windows Seven (64 bits)
>> guest, you have absolutely no delay, at any speed.
>>
>> Soren has recently improved a lot the qxl driver for Linux, but if
>> you accelerate the mouvement of your mouse, the drawing can't still
>> follow your mouse in Gimp.
>>
>> I don't know why different functions have been choosen into the qxl
>> drivers for Windows and Linux, but it could be interesting to
> because it was done by different people at different times.
>

That's clear. I also thought that this was the main reason.

However, since the qxl driver is the key to benefit from the best user 
experience in SPICE, my opinion is that it is important to optimize it 
as far as possible. Every effort for that goal is welcome.

Dominique

>> benefit from the best of these different versions.
>>
>>
>> Dominique Rodrigues
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