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Date: Wed, 08 Aug 2007 23:14:11 +0900
From: Tejun Heo <htejun@...il.com>
To: Mark Lord <lkml@....ca>
CC: Michael Sedkowski <sedmich@...il.com>, trenn@...e.de,
Robert Hancock <hancockr@...w.ca>,
"Rafael J. Wysocki" <rjw@...k.pl>,
Henrique de Moraes Holschuh <hmh@....eng.br>,
linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
linux-acpi@...r.kernel.org
Subject: Re: Disk spin down issue on shut down/suspend to disk
Mark Lord wrote:
> Tejun Heo wrote:
>> Michael Sedkowski wrote:
>>> Dnia 07-08-2007, Wt o godzinie 03:43 +0900, Tejun Heo napisał(a):
>>>> Does emergency unload count increase
>>>> after each power down?
>>> I think I got it.
>>> Using smartctl I've done a test and shut down, then repeted the test.
>>> The only values that where diffrent are temperatures and
>>> Hardware_ECC_Recovered which rised by 6 points.
>>> However I have no idea which of those is the "emergency count"...
>>> Full results in attachment.
>>>
>>> 192 Power-Off_Retract_Count 0x0032 100 100 000 Old_age
>>> Always - 388
>>
>> I think this is the one. You can test it by forcefully powering off the
>> machine (press power button for several secs or disconnect AC and
>> battery) and see whether the count increases.
>
> FWIW, Tejun, with 2.6.22, my new Seagate 160GB SATA drive (notebook)
> increments the "Power-Off_Retract_Count" on each suspend-to-RAM operation.
> It does not do any double spin-up/spin-down things though.
>
> What a mess.
Hmmm.. It shouldn't. libata now issues STANDBYNOW prior to entering
STR. Can you instrument code a bit and see whether it actually gets issued?
Thanks.
--
tejun
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