[LAU] disappointing experience with firewire

hi,
this is no complaint (!) about anything, just to reflect over my
yesterday's exerience with a newly purchased Focusrite Saffire Pro10,
connected via Belkin PCMCIA Firewirecard to my Lenovo R61 - the FW Chip
in this Laptop is one of those crappy Ricoh parts, I tried this, too,
but as expected it just didn't work...
So I compiled the ffado Release Candidate, afterwards compiled the
actual Jack 0.116.1 and finally got things running.
Compared to my Lexicon Omega Studio USB Device the performance of that
FW assembly (don't want to blame a single device of that chain) just was
disappointing, already in idlemode without any clients open the
jackserver showed a workload of roughly 5% (128 frames/3 periods), while
my Lexicon produces between 0.5 to 1% (128 frames/2 periods).
Opening Ardour and just replaying one of my sessions produced glitches
where only a strong hiss could be heard. (The session itself caused a
workload of less than 20%.) - I remember having had those hiss glitches
in my early days in 2005 with the MAudio Transit USB and Kernel 2.6.11 -
I never expected them coming back some day... *lol*
I then had a look on my interrupts and had to notice the FW Card sharing
it's interrupt (no 16) with the Nwidia Graficscard - so I might have
found the culprit - or not? - I don't know... :-(((
I tried to change the pci settings in the bios - no success.
Now my question to those who also tried firewire audio: was it a success
story for you from the beginning or did anybody make similar experiences
and how did you proceed further?
thanks for your attention
Susanne
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Received on Wed Dec 31 16:15:01 2008