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

[Kristian Høgsberg]

And that's the reason I added the pool: to avoid the cost of constantly faulting pages into new shm areas. I profiled window resizing under Weston and got the same result.

Kristian

> On Mar 14, 2016, at 7:20 AM, gtk+ (GNOME Bugzilla) <bugzilla at gnome.org> wrote:
> 
> Comment # 17 on bug 763350 from Ray Strode [halfline]
> (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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