Messages in this thread | | | Date | Tue, 10 Jul 2007 23:10:46 +0400 | From | Sergei Shtylyov <> | Subject | Re: [PATCH 1/3] Make the IDE DMA timeout modifiable |
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Hello.
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?
Their system seems to become unschedulable for this period of time (DMA timeouts happen from time to time) -- at least the keepalive daemon stopped replying during this period...
> 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.
They also have probably forgotten. :-)
> Thanks, > Bart
MBR, Sergei - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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