lkml.org 
[lkml]   [2007]   [Nov]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: "Fix ATAPI transfer lengths" causes CD writing regression
Alan Cox wrote:
>> Maybe we could set a limit here. If the ATAPI device keeps DRQ=1 and
>> exceeds the limit, we consider it as HSM violation and have EH handle it.
>
> On a DMA transfer its basically out of our control (and a PIO drain will
> lock some controllers solid until power cycle),

Do such controllers lock up on PIO draining after PIO transfers too?
Can you tell which are those controllers?

> but on PIO we know we
> never set a chunk size over 64K, so if we exceed 64K its time to apply a
> larger hammer

Draining is related to the amount of data the drive responds not to the
chunk size. I agree 64k should be enough for most cases but I think
there can be corner cases where this doesn't hold.

Thanks.

--
tejun
-
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/

\
 
 \ /
  Last update: 2007-11-05 01:09    [W:0.098 / U:0.284 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site