Re: [linux-audio-user] interrupts

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