Re: [PATCH 1/3] Make the IDE DMA timeout modifiable

From: Bartlomiej Zolnierkiewicz
Date: Fri Jun 15 2007 - 19:27:25 EST

On Tuesday 12 June 2007, Sergei Shtylyov wrote:
> Bartlomiej Zolnierkiewicz wrote:
> >>On Feb 20, 2007, at 5:44 PM, Bartlomiej Zolnierkiewicz wrote:
> >>>On Wednesday 21 February 2007 02:19, Suleiman Souhlal wrote:
> >>>>It can be changed via /proc/ide/hd?/settings.
> >>>Why do we need to change IDE DMA timeout dynamically?
> >>I've used it to test error recovery (for example).
> > Seems quite useable for developers but I would prefer not to
> > expose it in production kernels for end users.
> It seems that I have counter example of a customer asking if this timeout
> can be done configurable. :-)

May I ask what was the rationale for this request?

I have no strong feelings about adding this /proc/ide/ setting but I worry
that it could be (mis)used just to (unreliably) work-around problems...

> BTW, why the timeout is so damn long? 2*WAIT_CMD is 20 secs, and if DMA is
> not complete or interrupt pending, it may wait 10 more secs...

I really don't remember... :)

Maybe Mark or Alan could help with figuring this out.

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