On Thu, 2 Mar 2006, Lee Revell wrote:
> On Thu, 2006-03-02 at 21:03 +0100, Guennadi Liakhovetski wrote:
> > Hi all
> >
> > I am puzzled... I do:
> >
> > chrt -f -p 50 `pidof "IRQ 5"`
> > chrt -f 40 arecord -t wav -f cd -d 600 test.wav
> >
>
> That should Just Work - what happens if you leave the IRQs alone and
> just try arecord?
Sorry, didn't quite get it what you are suggesting: under rt or non-rt
kernel? Or under rt-kernel leaving IRQ-priority alone and only starting
arecord as an rt-process? arecord itself doesn't set rt-priority, looks
like. Initially I tried running arecord under normal kernel withowt chrt,
and, I think, it even worked before. Around 2.6.11-13? Although I did try
not to touch the PC during the recording. Not sure any more how easy /
well it worked, but I didn't notice any trouble... Then I started getting
those overruns (2.6.14-15?), first tried renicing arecord, it helped just
a bit, still was quite fragile. Then I started using rt-preempt...
> Please post the contents of /proc/interrupts
CPU0
0: 131986 XT-PIC [........N/ 0] pit
1: 176 XT-PIC [........./ 0] i8042
2: 0 XT-PIC [........N/ 0] cascade
5: 0 XT-PIC [........./ 0] uhci_hcd:usb4, VIA686A
7: 1 XT-PIC [........./ 0] parport0
8: 4 XT-PIC [........./ 0] rtc
9: 30 XT-PIC [........./ 0] acpi, uhci_hcd:usb2,
uhci_hcd:usb3, uhci_hcd:usb5
10: 4 XT-PIC [........./ 0] eth0
11: 60 XT-PIC [........./ 0] ehci_hcd:usb1
12: 127 XT-PIC [........./ 0] i8042
14: 7760 XT-PIC [........./ 0] ide0
15: 39 XT-PIC [........./ 0] ide1
NMI: 0
LOC: 0
ERR: 0
and no, I don't have any devices on usb4. IRQ5's prioirity was lower than
many others, so, I raised it.
Thanks
Guennadi
---
Guennadi Liakhovetski
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