[Spice-devel] Delay in Gimp when using qxl driver
Dominique Rodrigues
dominique.rodrigues at nanocloud.com
Sun Jan 22 10:43:53 PST 2012
Le 22/01/2012 19:39, Dominique Rodrigues a écrit :
> Le 22/01/2012 15:52, Dominique Rodrigues a écrit :
>> 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
>
> By the way, since last improvements from Soren on the qxl driver, the
> new consuming function is "qxl_update_area".
>
> Output of perf top (during rapid drawing in Gimp) :
>
>
> PerfTop: 930 irqs/sec kernel:39.8% exact: 0.0% [1000Hz
> cpu-clock], (all, 1 CPU)
> ----------------------------------------------------------------------------------------------------------------------------------
>
>
> samples pcnt function DSO
> _______ _____ _____________________________
> __________________________________________
>
> 1313.00 49.6% qxl_update_area
> /usr/lib64/xorg/modules/drivers/qxl_drv.so
> 294.00 11.1% retint_careful
> [kernel.kallsyms]
> 122.00 4.6% qxl_ring_push
> /usr/lib64/xorg/modules/drivers/qxl_drv.so
> 92.00 3.5% finish_task_switch
> [kernel.kallsyms]
> 75.00 2.8% _spin_unlock_irqrestore
> [kernel.kallsyms]
> 33.00 1.2% g_type_check_instance_cast
> /lib64/libgobject-2.0.so.0.2200.5
> 33.00 1.2% pixman_blt_sse2
> /usr/lib64/libpixman-1.so.0.18.4
> 31.00 1.2% _int_malloc
> /lib64/libc-2.12.so
> 30.00 1.1% __pthread_mutex_lock_internal
> /lib64/libpthread-2.12.so
> 30.00 1.1% g_type_check_instance_is_a
> /lib64/libgobject-2.0.so.0.2200.5
> 28.00 1.1% g_hash_table_lookup
> /lib64/libglib-2.0.so.0.2200.5
> 23.00 0.9% g_slice_alloc
> /lib64/libglib-2.0.so.0.2200.5
> 21.00 0.8% __pthread_mutex_unlock
> /lib64/libpthread-2.12.so
> 21.00 0.8% unix_poll
> [kernel.kallsyms]
> 19.00 0.7% native_flush_tlb
> [kernel.kallsyms]
> 16.00 0.6% __do_page_fault
> [kernel.kallsyms]
> 15.00 0.6% _int_free
> /lib64/libc-2.12.so
> 15.00 0.6% __memcpy_ssse3
> /lib64/libc-2.12.so
> 14.00 0.5% __strstr_sse2
> /lib64/libc-2.12.so
> 14.00 0.5% clear_page_c
> [kernel.kallsyms]
> 11.00 0.4% do_select
> [kernel.kallsyms]
> 9.00 0.3% qxl_surface_create
> /usr/lib64/xorg/modules/drivers/qxl_drv.so
> 8.00 0.3% g_atomic_int_exchange_and_add
> /lib64/libglib-2.0.so.0.2200.5
> 8.00 0.3% g_param_spec_pool_lookup
> /lib64/libgobject-2.0.so.0.2200.5
> 8.00 0.3% __GI___strcmp_ssse3
> /lib64/libc-2.12.so
> 7.00 0.3% __GI_vfprintf
> /lib64/libc-2.12.so
> 7.00 0.3% g_slice_free1
> /lib64/libglib-2.0.so.0.2200.5
> 7.00 0.3% sock_poll
> [kernel.kallsyms]
> 7.00 0.3% __GI___libc_malloc
> /lib64/libc-2.12.so
>
>
> Dominique
In fact, it seems to be the most important function in qxl, since when
you only have a mouse above the screen of the VM, it gives that :
PerfTop: 554 irqs/sec kernel:100.0% exact: 0.0% [1000Hz
cpu-clock], (all, 1 CPU)
----------------------------------------------------------------------------------------------------------------------------------
samples pcnt function DSO
_______ _____ _______________
__________________________________________
10.00 100.0% qxl_update_area
/usr/lib64/xorg/modules/drivers/qxl_drv.so
Dominique
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