[linux-audio-user] interrupts

[Atte André Jensen]

Lee Revell wrote:

> If it's a laptop you are screwed - the interrupt sharing is hard wired.

I'm screwed :-(

There was something about PCI interrupts in the BIOS, maybe I'm totally 
lucky (it's a thinkpad after all), will have a look.

Supposed the IRQ's are hardwired, Would it make sense to set the 
priority of IRQ 11 high (like 82 as mentioned in the web page)? Might 
get something else along with that, but, maybe it's better than nothing?

Also (while talking about priority); I have -P 70 set in qjackctl, 
however I don't see that priority with anything. Here's a moment of top:

   PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
  7417 atte      16   0  150m 148m  21m R 20.3 14.7   1:09.79 ardour
  7399 atte      16   0 35616  34m  19m S  6.0  3.4   0:22.13 ams.real
  5233 atte      15   0 30484  28m  17m S  5.6  2.8   1:05.00 qjackctl
  5242 atte      19   0 35728  34m 2556 S  4.0  3.5   0:44.81 jackd
  7391 atte      15   0 45344  44m 8028 S  4.0  4.4   0:41.56 zynaddsubfx
  1825 root     -44  -5     0    0    0 S  1.7  0.0   0:15.75 IRQ 11
  4670 root      15   0  1412  172  116 S  1.0  0.0   0:06.19 thinkpad-keys
  7393 atte      15   0 46076  44m  16m S  1.0  4.5   0:06.69 seq24
  4404 root      15   0 66272  17m 7184 S  0.7  1.7   0:26.13 Xorg
  7392 atte      15   0 41168  40m  17m S  0.7  4.0   0:06.68 specimen
     7 root      -2   0     0    0    0 S  0.3  0.0   0:00.49 
softirq-tasklet
  1738 root     -45  -5     0    0    0 S  0.3  0.0   0:00.60 IRQ 15
  5261 atte      15   0 42360  16m 8644 S  0.3  1.7   0:05.72 xfce4-terminal
     1 root      16   0  1568  528  460 S  0.0  0.1   0:01.19 init
     2 root      -2   0     0    0    0 S  0.0  0.0   0:00.00 softirq-high/0
     3 root      -2   0     0    0    0 S  0.0  0.0   0:04.05 
softirq-timer/0
     4 root      -2   0     0    0    0 S  0.0  0.0   0:00.00 
softirq-net-tx/

This is running 2.6.15-rt21. I guess it's the PR column we're talking 
about, right? So almost all sound related should be higher, esp the IRQ 
11 at -44. Where are the priorities for stuff like ardour and synths 
set? How about the nice levels, are they ok and if not is the only 
possibility to renice them? Also; looking at the mentioned web page, am 
I supposed to call chrt once or on every boot?

Lot of questions, sorry...

-- 
peace, love & harmony
Atte