Daniel Kristjansson wrote:
On Wed, 2005-03-30 at 15:45 -0500, Tom Lichti wrote:
When running the configure script I notice that my CPU (model name
: AMD Sempron(tm) 2200+) is detected and compiled as 'pentiumpro'.
There was a script posted to one of the lists called gccopts, which on
my system reports:
-march=athlon-xp -mfpmath=sse -msse -mmmx -m3dnow
The "-msse -mmmx -m3dnow" are redundant with "-march=athlon-xp"
and will not improve performance much without -mfpmath=sse.
I'm not adding -mfpmath=sse as a default unless Issac wants
it. ffmpeg is uses hand optimized assembler and -mfpmath=sse
may trigger bugs in the compiler or ffmpeg which are difficult
to debug.
But if you can show -march=athlon-xp is faster than the default
I'll certainly make that change. Just play the same video with
each both sets of flags give me the results of
time mythtv 60_second_video_file.mpg
Not sure what that is supposed to show, other than it takes 60 seconds
to play 60 seconds? Anyway, the results of that test (using a CVS build
from the 23rd, one from this afternoon, both with 'pentiumpro' as the
march, and one from today with 'athlon-xp' as the march) didn't show any
appreciable difference doing the above test. I just catted /dev/video1
to tmp.mpg for 60 seconds, and then used that as the source for the test.
Tom
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