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Subject: Re: time accounting problem (powerpc only?)
From: Johannes Berg <johannes@sipsolutions.net>
To: =?ISO-8859-1?Q?J=F6rg?= Sommer <joerg@alea.gnuu.de>
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Date: Fri, 23 Nov 2007 21:37:25 +0100
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Hi,

> % 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      =20
>   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     radeon@pci:0000:00:10.0
> + 42:    1415084   MPIC 1    Level     keywest i2c
> + 47:    2075193   MPIC 1    Level     GPIO1 ADB
> + 48:    6686778   MPIC 1    Level     radeon@pci: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
>=20
> I don't know where they come from, but that's the cause of the high IRQ
> time.

Are you sure about that? I'm fairly sure that I always had rather high
numbers of interrupt here. And the system isn't sluggish or unresponsive
as you'd expect if the IRQs actually did take 90% of the CPU time!

johannes

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