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<TITLE>RE: [LAU] Phonic Helix Board 12 FireWireMKIIcompatibility(linux/ffado)</TITLE>
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<P><FONT SIZE=2>>Simon W. Fielding wrote:<BR>
>><BR>
>> OK - I now have a working basic FC10 system - relevant details are :-<BR>
>><BR>
>> Hardware: Toshiba Tecra M3<BR>
>> Kernel: 2.6.26.8-1.rt15.1.fc10.ccrma.i686.rt<BR>
>> Jackd: jackdmp 1.9.1<BR>
>> ffado: 2.0-0.6.rc1.fc10.ccrma (libffado 1.999.40)<BR>
>><BR>
>><BR>
>> Initial cursory testing shows (no recording load, just an idle mixer<BR>
>> with nothing connected) :-<BR>
>><BR>
>> jackd -R -dfirewire -r96000 -p16 -n3 ... jackd won't even start - uses<BR>
>> too much CPU<BR>
>> jackd -R -dfirewire -r96000 -p32 -n3 ... jackd won't even start - uses<BR>
>> too much CPU<BR>
><BR>
>these are insanely low settings.<BR>
>i have never *ever* heard of anybody running successfully at -p16 -n3,<BR>
>and you are trying it at 96k. for the rest of us, that would be -p8!<BR>
<BR>
<BR>
I'm aware of that. I have no particular intention to even use this piece of kit,<BR>
let alone at those settings but I did volunteer to take a look at it so I may as<BR>
well try to be reasonably comprehensive where possible. If the info is remotely<BR>
useful to somebody, I don't feel I've wasted my time.<BR>
<BR>
I'm using stupidly excessive settings to see what breaks and where, given that<BR>
this is all running on an underpowered spare laptop I've got lying round the office<BR>
which is not really up to the job.<BR>
<BR>
Sorry - all that sounded a bit more pompous than I intended. Please try not to read<BR>
anything in to that.<BR>
<BR>
Cheers,<BR>
Simon<BR>
imnsho, -p128 should be perfectly fine for 96k. don't waste your time<BR>
"tuning" your system for latencies below that.<BR>
<BR>
there are good reasons to perform audio computations in chunks. i don't<BR>
know why people seem to get warm fuzzy feelings from invalidating their<BR>
cache lines for every new sample :)<BR>
<BR>
<BR>
<BR>
<BR>
<BR>
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