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SubjectRe: AIC7xxx panic
On Sun, Oct 07, 2001 at 10:31:48PM -0400, Jim Crilly wrote:
> I changed AHC_NSEG from 128 to 512 and as expected the panic went away,
> but does this mean the default should be higher in the kernel or is
> there a real bug here? The main reason I wonder is because it ran fine
> on disk 0 but panic'd on disk 1.

Perhaps this is related (from 2.4.10-acX thread later on l-k):

>From Mon Oct 8 18:34:32 2001
Subject: Re: linux-2.4.10-acX
To: (Mike Fedyk)
From: Alan Cox <>

> > - Elevator flow control
> Where can I find more information on this?

Read the ll_rw_blk diff. Basically it tries to avoid too many locked
buffers clogging up memory and killing the box. I'm not totally sure its
the right approach.

Were there recent changes in ll_rw_blk which are being addressed by
"Elevator flow control"? As suggested earlier in this thread, the cause
might be a few layers up, and this seemed relevant.

Can anyone confirm or shed any additional light on this?


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