[Openchrome-users] Slow performance with Flash player#

[Brian Candler]

On Mon, Jun 25, 2007 at 09:30:07PM +0200, Benno Schulenberg wrote:
> Brian Candler wrote:
> > Hmm, well actually Youtube isn't bad - about least 6 fps (just
> > done by counting frames while I keep one eye on a digital clock)
> 
> On a KM400 with a 2 GHz Athlon playback is smooth, at about 35% CPU 
> usage.  For example http://www.youtube.com/watch?v=Fc6FlowLciA -- 
> it's just like on TV, so at least 25 fps.  Only the first two or 
> three seconds there's some stutter.
> 
> Is it not simply some memory bandwith issue?
> 
> # grep -A6 Benchmarking /var/log/Xorg.0.log
> (II) VIA(0): Benchmarking video copy. Less is better.
> (--) VIA(0): Timed   libc YUV420 copy... 3048810. Throughput: 403.8 MiB/s.
> (--) VIA(0): Timed kernel YUV420 copy... 3035232. Throughput: 405.6 MiB/s.
> (--) VIA(0): Timed    SSE YUV420 copy... 3010814. Throughput: 408.9 MiB/s.
> (--) VIA(0): Timed    MMX YUV420 copy... 2985347. Throughput: 412.4 MiB/s.
> (--) VIA(0): Timed 3DNow! YUV420 copy... 3014974. Throughput: 408.3 MiB/s.
> (--) VIA(0): Timed   MMX2 YUV420 copy... 2995928. Throughput: 410.9 MiB/s.

Thanks for that - figures here don't look good:

(II) VIA(0): Benchmarking video copy. Less is better.
(--) VIA(0): Timed   libc YUV420 copy... 15725702. Throughput: 37.7 MiB/s.
(--) VIA(0): Timed kernel YUV420 copy... 15610756. Throughput: 38.0 MiB/s.
(--) VIA(0): Timed    SSE YUV420 copy... 8894087. Throughput: 66.7 MiB/s.
(--) VIA(0): Timed    MMX YUV420 copy... 9003383. Throughput: 65.9 MiB/s.
(--) VIA(0): Ditch 3DNow! YUV420 copy... Not supported by CPU.
(--) VIA(0): Timed   MMX2 YUV420 copy... 8775754. Throughput: 67.6 MiB/s.