Re: [FFADO-user] ScratchAmp2 (FS2) problems

[Arnold K. <ar...@ar...>]

Am Montag, 26. Mai 2008 schrieb g miernicki:
> Pulled the latest SVN and the installer got a bit further, but still
> errors:
> scons: *** DirNodeInfo instance has no attribute 'csig'
> scons: building terminated because of errors.

Thats a scons-error and nothing we can change. But all is well from the 
install-side. :-)

> and compiled/installed once again.... I can now start jackd!
>  /usr/bin/jackd -p512 -t2000 -dfirewire -r48000 -p512 -n3*
> seems to be the lowest set of configuration options I can use to avoid
> XRUNs, but this puts the latency at about 32ms which isn't all that great
> :( You would think with 400mbps firewire I would be able to get something
> much lower as I used to use this card under Windows and was able to achieve
> around 2.5ms.

I really doubt that you got windows to really do such low latency. Maybe it 
told you that it was that way, but I don't think that reality proves that. 
After all windows can't schedule things faster then 10msecs...
And my own (limited) testing on windows didn't even get me below the 
100ms-line.

> Any suggestions on how to reduce the latency further?

If you add -R to your jackd-options (before the -dfirewire), you will get 
realtime-support which should get you down to 3x128 provided your system is 
set up correctly. Which in turn means ~8ms latency + the buffers of the 
device. And I don't really think that you need get that much lower. 3x128 is 
after all good enough to do foh-mixing. :-)

Have fun,

Arnold
-- 
visit http://www.arnoldarts.de/
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