linux-kernel - Re: 2.6.16.32 stuck in generic_file_aio

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Message-Id: <20061214011042.7b279be6.akpm@osdl.org>
Date:	Thu, 14 Dec 2006 01:10:42 -0800
From:	Andrew Morton <akpm@...l.org>
To:	Igmar Palsenberg <i.palsenberg@...-ict.nl>
Cc:	linux-kernel@...r.kernel.org, npiggin@...e.de,
	erich <erich@...ca.com.tw>
Subject: Re: 2.6.16.32 stuck in generic_file_aio_write()

On Thu, 14 Dec 2006 09:55:38 +0100 (CET)
Igmar Palsenberg <i.palsenberg@...-ict.nl> wrote:

> 
> > > Hmm.. Switching CONFIG_HZ from 1000 to 250 seems to 'fix' the problem. 
> > > I haven't seen the issue in nearly a week now. This makes Andrew's theory 
> > > about missing interrupts very likely.
> > > 
> > > Andrew / others : Is there a way to find out if it *is* missing 
> > > interrupts ?
> > > 
> > 
> > umm, nasty.  What's in /proc/interrupts?
> 
> See below. The other machine is mostly identifical, except for i8042 
> missing (probably due to running an older kernel, or small differences in 
> the kernel config).
> 

Does the other machine have the same problems?

Are you able to rule out a hardware failure?

> [jdiict@...01 ~]$ cat /proc/interrupts
>            CPU0       CPU1
>   0:   73702693   74509271   IO-APIC-edge      timer
>   1:          1          1   IO-APIC-edge      i8042
>   4:       2289       8389   IO-APIC-edge      serial
>   8:          0          1   IO-APIC-edge      rtc
>   9:          0          0   IO-APIC-fasteoi   acpi
>  12:          3          1   IO-APIC-edge      i8042
>  16:  203127788          0   IO-APIC-fasteoi   uhci_hcd:usb2, eth0
>  17:        525        492   IO-APIC-fasteoi   uhci_hcd:usb4
>  18:   13000070   67584889   IO-APIC-fasteoi   arcmsr
>  19:          0          0   IO-APIC-fasteoi   ehci_hcd:usb1
>  20:          0          0   IO-APIC-fasteoi   uhci_hcd:usb3
> NMI:          0          0
> LOC:  148127756  148133476
> ERR:          0
> MIS:          0

The disk interrupt is unshared, which rules out a few software problems, I
guess.

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