9 Feb
2009
9 Feb
'09
1:58 p.m.
On Mon, 9 Feb 2009 16:47:39 -0000
"Simon W. Fielding" <s.fielding(a)wmcce.org> wrote:
OK - I now have a working basic FC10 system - relevant
details are :-
Hardware: Toshiba Tecra M3
Kernel: 2.6.26.8-1.rt15.1.fc10.ccrma.i686.rt
Jackd: jackdmp 1.9.1
ffado: 2.0-0.6.rc1.fc10.ccrma (libffado 1.999.40)
Initial cursory testing shows (no recording load, just an idle mixer with nothing
connected) :-
jackd -R -dfirewire -r96000 -p16 -n3 ... jackd won't even start - uses too much CPU
jackd -R -dfirewire -r96000 -p32 -n3 ... jackd won't even start - uses too much CPU
Both of the above seem to sometimes leave the 1394 bus in a strange state. A forced bus
reset using
gscanbus seems to fix it.
jackd -R -dfirewire -r96000 -p64 -n3 ... jackd starts - uses approx 70% CPU with xruns
every 10-20 seconds
jackd -R -dfirewire -r96000 -p128 -n3 ... jackd starts - uses approx 50% CPU - no xruns
jackd -R -dfirewire -r96000 -p256 -n3 ... jackd starts - uses approx 45% CPU - no xruns
jackd -R -dfirewire -r96000 -p512 -n3 ... jackd starts - uses approx 25% CPU - no xruns
Hmm this is good and bad news. That it works and does so without xruns is great but
I'm not sure what
to make of the processor usage. For comparison, if I setup my inspiron 9400 to use -r96000
-p256 -n3
it uses less than a tenth of what you see. Mine has a core 2 duo t7200 2ghz CPU and an
intel HDA
but even so.. 45% seems pretty onerous and surely not an indication that my system is 10
times faster than yours.
This is all I have time for today - I'll try and
do more later this week. If I've missed any useful
details, please ask and I'll try to get them posted.
I appreciate you going to the trouble. This is exactly what I wanted to know. :)
pete.