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SubjectRe: 2.6.15-mm2


On 13/01/2006 1:31 a.m., Ric Wheeler wrote:
> Reuben Farrelly wrote:
>> On 13/01/2006 12:18 a.m., Tejun Heo wrote:
>>> On Thu, Jan 12, 2006 at 09:38:48PM +1300, Reuben Farrelly wrote:
>>> [--snip--]
>>>
>>>> [start_ordered ] f7e8a708 -> c1b028fc,c1b029a4,c1b02a4c infl=1
>>>> [start_ordered ] f74b0e00 0 48869571 8 8 1 1 c1ba9000
>>>> [start_ordered ] BIO f74b0e00 48869571 4096
>>>> [start_ordered ] ordered=31 in_flight=1
>>>> [blk_do_ordered ] start_ordered f7e8a708->00000000
>>>> [blk_do_ordered ] seq=02 f74ccd98->f74ccd98
>>>> [blk_do_ordered ] seq=02 f74ccd98->f74ccd98
>>>> [blk_do_ordered ] seq=02 c1b028fc->00000000
>>>> [blk_do_ordered ] seq=02 c1b028fc->00000000
>>>> [blk_do_ordered ] seq=02 c1b028fc->00000000
>>>
>>>
>>> Yeap, this one is the offending one. 0xf74ccd98 got requeued in front
>>> of pre-flush while draining and when it finished it didn't complete
>>> draining thus hanging the queue. It seems like it's some kind of
>>> special request which probably fails and got retried. Are you using
>>> SMART or something which issues special commands to drives?
>>
>>
>> No SMART, although I should be (rebuilt the system a few months
>> ago..and must
>> have missed it).
>>
>> Are there any other things which could be contributing to this?
>> <scratches head>
>>
> Could this be hdparm or something tweaking the drive write cache
> settings, etc?

hdparm isn't configured on the box by me or called by initscripts in Fedora
either, AFAIK.

reuben

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