Hallo Johannes,
Johannes Berg <[EMAIL PROTECTED]> wrote:
> Doing some scripting to read /proc/stat every half second and print the
> differences, I get output like this on a mostly idle system:
>
> # for reference:
> # [user, nice, system, idle, iowait, irq, softirq, steal, guest]
>
> [4, 0, 3, 46, 0, 264, 0, 0, 0]
>
> As you can see, the "irq" time is very high so that "user" (mostly my
> CPU burning program) only accounts for maybe 15%. This leads to
> powernowd thinking that all is fine and no switching is required. Also,
> the whole stuff leads to top(1) displaying about 80-90% "hi" (hard irq?
> calculated as irq - softirq?) time.
I've the same problem and I see these interrupts in /proc/interrups:
% diff /proc/interrupts <(sleep 2; cat /proc/interrupts)
--- /proc/interrupts 2007-11-23 15:04:06.004846901 +0100
+++ /proc/self/fd/11 2007-11-23 15:04:05.952841422 +0100
@@ -1,15 +1,15 @@
CPU0
21: 5 MPIC 1 Edge PMac Output
24: 68 MPIC 1 Level ide1
- 25: 18063968 MPIC 1 Level VIA-PMU
+ 25: 18064241 MPIC 1 Level VIA-PMU
26: 2426 MPIC 1 Level keywest i2c
29: 1 MPIC 1 Level ohci_hcd:usb2
30: 1 MPIC 1 Edge PMac Input
39: 843910 MPIC 1 Level ide0
41: 990592 MPIC 1 Level eth0
- 42: 1415066 MPIC 1 Level keywest i2c
- 47: 2075159 MPIC 1 Level GPIO1 ADB
- 48: 6686659 MPIC 1 Level [EMAIL PROTECTED]:0000:00:10.0
+ 42: 1415084 MPIC 1 Level keywest i2c
+ 47: 2075193 MPIC 1 Level GPIO1 ADB
+ 48: 6686778 MPIC 1 Level [EMAIL PROTECTED]:0000:00:10.0
61: 0 MPIC 1 Edge Sound Headphone Detection
63: 94238 MPIC 1 Level ehci_hcd:usb1, ohci_hcd:usb3,
ohci_hcd:usb4
BAD: 19
I don't know where they come from, but that's the cause of the high IRQ
time.
Bye, Jörg.
--
Je planmäßiger ein Mensch vorgeht,
desto stärker mag ihn der Zufall treffen.
Erich Krunau ‚Die Physiker‘
_______________________________________________
Linuxppc-dev mailing list
Linuxppc-dev@ozlabs.org
https://ozlabs.org/mailman/listinfo/linuxppc-dev
