On Sun, 2007-08-26 at 20:13 -0700, Mike wrote:
> On Mon, 27 Aug 2007, Tim wrote:
>
> > Tim:
> >>> I don't have the original poster's problem, but I tried that command to
> >>> see what happens. The same results, each time:
> >>>
> >>> [root@bigblack ~]# cat /proc/interrupts | grep timer
> >>> 0: 180 IO-APIC-edge timer
> >
> > Mike:
> >> Weird. I wonder if there is another interrupt used to 'bump' the clock?
> >> Just for grins try it w/o the grep. There should be a list of a dozen or
> >> so interrupts. See if the line associated with rtc is 'racing'. Or
> >> maybe there's yet another interrupt used (other than ethX, ideX etc.).
> >
> > [root@bigblack ~]# cat /proc/interrupts
> > CPU0
> > 0: 179 IO-APIC-edge timer
> > 1: 2 IO-APIC-edge i8042
> > 6: 5 IO-APIC-edge floppy
> > 7: 0 IO-APIC-edge parport0
> > 8: 0 IO-APIC-edge rtc0
> > 10: 0 IO-APIC-edge MPU401 UART
> > 12: 4 IO-APIC-edge i8042
> > 14: 13217 IO-APIC-edge libata
> > 15: 1842 IO-APIC-edge libata
> > 16: 3454 IO-APIC-fasteoi ohci_hcd:usb1, ohci_hcd:usb2
> > 17: 502 IO-APIC-fasteoi SiS SI7012, eth0
> > 18: 17782 IO-APIC-fasteoi nvidia
> > 20: 0 IO-APIC-fasteoi acpi
> > NMI: 0
> > LOC: 93114
> > ERR: 0
> > MIS: 0
> >
> > I've rebooted since the last test, which probably accounts for the 179
> > where I previously had 180. But I get unchanging results, again. Each
> > iteration of the command produces the same results.
> >
>
> So I guess I can write that off as a troubleshooting technique in newer
> kernels. One more thing out of curiosity if you get a chance, does the
> timestamp value in 'cat /proc/schedstat' change on subsequent views?
I guess you were expecting something more like this:
$ cat /proc/interrupts | grep timer
0: 611209 XT-PIC-XT timer
$ cat /proc/interrupts | grep timer
0: 611766 XT-PIC-XT timer
$ cat /proc/interrupts | grep timer
0: 612404 XT-PIC-XT timer
Now I wonder why mine isn't like the others. This is off a Thinkpad T41
running kernel-2.6.22.4-65.fc7.
Interestingly, an old P-III server in the closet looks more like the
above report:
0: 842 IO-APIC-edge timer
with no change over several checks.
>
> -- Mike
>
>
--
Matthew Saltzman
Clemson University Math Sciences
mjs AT clemson DOT edu
http://www.math.clemson.edu/~mjs
