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SubjectRe: I/O lockup


Well, Arjan just told me that qla2x00 is doing weird shit. He seems to be
fixing it...

On Mon, 12 Nov 2001, Marcelo Tosatti wrote:

>
>
> On Mon, 12 Nov 2001, Gord R. Lamb wrote:
>
> > Hi everyone,
> >
> > I've been having a problem for a while now with a strange lockup induced
> > under heavy SCSI I/O (particularly when I write directly to block devices
> > with dd of=/dev/sd?, but also when writing to a filesystem on that
> > device). I'm writing around 50-100mb/sec over FC (qlogic 2200) under
> > Linux 2.4 (tried 2.4.3 through 2.4.10).
> >
> > It seems that some vm or I/O related spinlock is being taken and held, but
> > not released (?). There is no oops or BUG() or anything (no messages at
> > all in fact).. all I/O just stops. I can still invoke sysrq, type
> > characters at the console, etc. In fact, usually top continues to run and
> > display kswapd as the dominant process.
>
> If kswapd is eating the CPU, its probably a VM problem.
>
> Please try the newest 2.4.xx which has VM updates and if the problem
> happens again, tell us.
>
>
>
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