[tremor] Current Performance?
Segher Boessenkool
segher at koffie.nl
Sun Oct 27 18:59:45 PST 2002
> How much CPU does it take to do stereo 44k1 s/s decode?
At least one ;)
> I'm working on getting Linux to run on a Webpal (40MHz ARM710 core).
> Can I expect to be able to get ogg/vorbis files to play?
As the 710 doesn't have any cache, if you don't use sram for your main
memory, all bets are off -- dram is way too slow.
Unless of course your chip _does_ contain a cache, but a better cache
than the quite crappy arm720 cache :)
> It would be nice to drop a NIC in one of these, set it next to my
> stereo, and stream Ogg files from my file server--or a web
> radio site, etc.
>
> Is there any estimate of what the minimal CPU to decode to a buffer,
> from a buffer is?
For arm7, i'd say about 10-20 million cycles + memory wait states.
This is just an estimate though, and i certainly don't know if libvorbis
is optimized enough to make this.
> I can't hold I/O agains the code as the cost
> of that will vary too much from platform/OS to platform/OS.
True words.
<p>Segher
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