Re: Were's the weak link?

["Mike Taht" <mike.taht@xxxxxxxxx>]

On 1/20/07, linuxmedia4@xxxxxxxxxxxx <linuxmedia4@xxxxxxxxxxxx > wrote:

>> Can anyone spot where the "weak link" is in my system. I put in this
>> post (what I believe) is the most relevant information...

Is cpuspeed running? If so, disable it.

Also I note that ingo is keeping a repository of the latest rt kernels (he's at 2.6.20 something at present) at:

http://people.redhat.com/mingo/realtime-preempt/yum.README

This series has been pretty good for me, but YMMV

>>
>> 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

-- 
Mike Taht
PostCards From the Bleeding Edge
http://the-edge.blogspot.com
"Have you noticed that the earth is tipped away from the sun at the moment? Really sloppy quality control. I filed a request to have it tipped towards the sun again, but you know how these things go. Probably take 'em 6 months to fix it" - 
E.H.