[Wayland-bugs] [Bug 763350] drawing performance worse than X

[gtk+ (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=763350

--- Comment #17 from Ray Strode [halfline] <rstrode at redhat.com> ---
(In reply to Christian Hergert from comment #9)
> I was curious about the raw memfd costs, so put together an informative test:
> 
>   - memfd_create()
>   - ftruncate(2*page_size)
>   - mmap()
>   - page fault all pages
>   - munmap()
>   - close()
> 
> The cost for all of the above is about .06 msec. So not really that bad.
> Interestingly, half of the time is spent on close()!

are you accounting for faulting in the compositor too? if you run,

$ ./test-panel &
$ sysprof-cli -p $! sysprof-output

then open and close the panels like a billion times, then switch back to the
terminal and hit ctrl-c 

then run

$ sysprof sysprof-output

what's at the top of your profile ? I see most of the time spent in
sse2_fill/page_fault/shmem_fault, but for me the animations are 60 fps anyway.
I'm curious what your sysprof profile looks like.

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