> My new desktop machine reports very high interrupt rates in stats,
> the bargraph on stats is stock at 100%, a count of 176000 (ints/sec ?)
>
> I added erik's interrupt counter code and see that these are occuring
> on irq 10, which my hardware ties to the SATA interface and usbuhci
> (a combined Intel 82801EB/ER chipset).
>
> the other difference between this system and my previous one is
> I now have a USB keyboard and mouse (rather than PS2).
>
> Is there a problem with my USB or is it a case of "they all do that"?
>
> -Steve
>
> -----------------
> larch% grep '10|clock' /dev/irqalloc
> 50 18 1196593585 clock
> 105 10 167041275929 sdF (ata)
> 105 10 167041275930 sdE (ata)
> 105 10 167041275932 usbuhci
if you're using the standard HZ of 100, then your machine
has been up ~138/nmach days? if that's correct, then nevermind.
otherwise, is it possible that you are counting cycles and not
interrupts?
in any event, if you use a 9atom kernel, you may be able to
get the ata drives on a different vectors (assuming they support msi)
and then you could tell more precicely what's going on.
sadly usb is incompatable with msi; broken by design.
as a wild guess, i think you could fix your problem either by
using the 9atom ide driver or telling the motherboard to
present the drives as ahci.
- erik
p.s the format i've been using for irqalloc on 386 has been
Reads from irqalloc return the enabled interrupts, one line
per interrupt. Each line contains three fields separated by
white space: the trap [sic] number, the IRQ it is assigned to, and
the name of the device using it.
minooka; cat /dev/irqalloc
3 0 0 0 trap
debugpt
7 0 0 0 trap
mathemu
8 0 0 0 trap
doublefault
9 0 0 0 trap
mathover
14 0 0 0 trap
fault386
15 0 0 0 trap
unexpected
16 0 0 0 trap
matherror
50 18 9052758077 20828942019320 lapic clock
51 19 0 0 lapic
lapicerror
63 31 0 0 lapic
lapicspurious
65 1 6 4231380 ioapic kbd
73 15 76377411 457040194416 msi
ether0
81 15 520404 4488965428 msi
ether1
89 5 0 0 msi
ether2
97 4 408 7531904 ioapic COM1
105 11 3 51732 msi sdE
(ahci)
see http://www.quanstro.net/magic/man2html/3/arch
