Re: building kernel
>>>>> On 29 Nov 2002 20:07:21 +0100
>>>>> "FH" == Falk Hueffner <falk.hueffner@student.uni-tuebingen.de> wrote:
FH>
FH> Alexander Kotelnikov <sacha@debian.org> writes:
>> Actually, I've started my experiments after I found out that
>> decompression of digital audio (mp3, ogg, etc) that are floation
>> point operations IIRC, are peformed on my 600ua much less
>> efficiently, than, say, on Celeron 566. For instance, xmms plaing
>> 128kbps takes about 6% of alpha and about 1% of C566.
FH>
FH> I don't think they actually use floating point; floating point math is
FH> one of the areas where Alphas really excel. Those routines are most
FH> likely written with MMX on i386, but use plain integer math on Alpha.
FH>
FH> Recompiling with gcc flags specific to your architecture might help
FH> with xmms; I recompiled xmms after I noticed it was very slow, with
FH> -mcpu=ev67, and it got noticeably faster. You can find the optimal gcc
Ohh, seems you have pretty nice Alpha CPU
FH> flags for your machine with http://people.debian.org/~falk/gcc-arch.
I got absolutely no performance improvement in .ogg playing after
libvorbis rebuild with -mcpu=ev56 :(.
--
Alexander Kotelnikov
Saint-Petersburg, Russia
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