[linux-audio-user] Were's the weak link?

[linuxmedia4 at netscape.net]

 >> Can anyone spot where the "weak link" is in my system. I put in this
 >> post (what I believe) is the most relevant information...
 >>
 >> My system...
 >> Dell Precision M50 laptop
 >> 2 GHz Processor
 >> 1 Gig Ram
 >> 2.6.16-1.2080.16.rrt.rhfc5.ccrma
 >> 7200rpm hard drive
 >>
 >> 'cat /proc/interrupts' (before disabling peripherals) shows:
 >> 11:    8900  XT-PIC [........./  0]  yenta, yenta, yenta,
 >> pcmcia2.0, Indigo IO, uhci_hcd:usb1, uhci_hcd:usb2, ohci1394

 > What does IRQ 11 look like when the unused drivers are unloaded?

Actually, I never went back to (en)abling the peripherals in BIOS. I'll 
wait untill I finally find the culprit and then enable them and see what 
happens. So this reflects my current situation...

   0: 555937  XT-PIC [........N/  0]  pit
   1:   1344  XT-PIC [........./  1]  i8042
   2:      0  XT-PIC [........N/  0]  cascade
   7:      0  XT-PIC [........./  0]  Intel 82801CA-ICH3, Intel 
82801CA-ICH3 Modem
   8:      1  XT-PIC [........./  0]  rtc
   9:      0  XT-PIC [........./  0]  acpi
  11:   7038  XT-PIC [........./  0]  yenta, yenta, Indigo IO, 
uhci_hcd:usb1, uhci_hcd:usb2, ohci1394, eth0
  12:  24456  XT-PIC [........./  0]  i8042
  14:  14998  XT-PIC [........./  0]  ide0
NMI:      0
LOC:      0
ERR:      0
MIS:      0

 > Did you run the rtirq script?

During bootup, I see mentions of S88rtirq, so I looked and I see there 
is '/etc/rc.d/rc3.d/S88rtirq'.

 > Does JACK report xruns when these glitches happen?

While recording with ecasound (with realtime privileges) and running 
'jackd -v -R -dalsa -r48000 -p512 -n2 -D -Chw:2 -Phw:2'... during the 
interruptions, I received these messages...

(I get interruptions with every combination of periods and buffer sizes 
I've tried)

delay of 42746.000 usecs exceeds estimated spare time of 9632.000; 
restart ...
delay of 42669.000 usecs exceeds estimated spare time of 9625.000; 
restart ...
delay of 42647.000 usecs exceeds estimated spare time of 9608.000; 
restart ...
delay of 42646.000 usecs exceeds estimated spare time of 9700.000; 
restart ...
delay of 42600.000 usecs exceeds estimated spare time of 9741.000; 
restart ...

Thanks... keep the suggestions coming. I'm not going to settle for this 
as the result after investing 5 years into Linux/Audio.

Rocco