26 Sep
2009
26 Sep
'09
7:35 a.m.
On Sat, Sep 26, 2009 at 04:28:42AM +0200, Jens M Andreasen wrote:
Anything I could try to isolate that?
Arnout
On Fri, 2009-09-25 at 21:50 +0200, Arnout Engelen
wrote:
This was without RT-patches. I now installed the 2.6.31-rt11-686-multimedia
from 64studio. Without any changes, this actually seemed to perform somewhat
poorer compared to the stock Debian one.
I did some tweaks:
- increased the rtprio for the USB IRQ handler
- decreased the 'latency_timer' value for my wireless network card and cardbus
slot
- tried to increase 'latency_timer' for the USB controller, but it remained
at 0 - i guess it doesn't support this option
After this, the performance is comparable.
Attached are the results on an untuned Debian
Testing machine (2.6.30-1-686)
started with 'chrt -f 50 ./src/alsa-midi-latency-test -s 40'
What do you mean by "untuned"? Is this without RT-patches? The Edirol
sure outperformed the MidiSport - the difference didn't seem huge
though.
What I find most disturbing is the distribution, ranging from better
than perfect to on the edge of unusable. How much of this can be
attributed to the USB-stack?