Messages in this thread | | | Date | Fri, 13 Jul 2007 23:40:08 +0400 | From | Sergei Shtylyov <> | Subject | Re: [PATCH 1/3] Make the IDE DMA timeout modifiable |
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Mark Lord wrote:
>>> I've lost the original question from this thread, but the idea of the
>> The original question concerned specifically the DMA command >> timeout which is twice more than the usual one, WAIT_CMD (10 seconds).
>>> longish >>> timeouts was that drive *may* be spun down ("standby"), and thus have >>> to spin >>> up again to complete media commands. Back then, drives were much >>> slower at >>> spinning up than nowadays, and the ATA spec says to allow up to 30 >>> seconds.
>> Well, that doesn't explain the DMA case.
> When a drive is in standby, we don't send it anything special to wake up. > So even DMA commands have to have a long enough timeout to allow > for spinning up.
Yes, but why *twice* as long as the others?
> Cheers
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