From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tejun Heo <htejun@gmail.com>
Subject: Re: Disk spin down issue on shut down/suspend to disk
Date: Wed, 08 Aug 2007 23:14:11 +0900
Message-ID: <46B9CFB3.6020402@gmail.com>
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To: Mark Lord <lkml@rtr.ca>
Cc: Michael Sedkowski <sedmich@gmail.com>, trenn@suse.de, Robert Hancock <hancockr@shaw.ca>, "Rafael J. Wysocki" <rjw@sisk.pl>, Henrique de Moraes Holschuh <hmh@hmh.eng.br>, linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org, linux-acpi@vger.kernel.org

Mark Lord wrote:
> Tejun Heo wrote:
>> Michael Sedkowski wrote:
>>> Dnia 07-08-2007, Wt o godzinie 03:43 +0900, Tejun Heo napisa=C5=82(=
a):
>>>> Does emergency unload count increase
>>>> after each power down?=20
>>> I think I got it.
>>> Using smartctl I've done a test and shut down, then repeted the tes=
t.
>>> 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 =20
>>> 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.
>=20
> FWIW, Tejun, with 2.6.22, my new Seagate 160GB SATA drive (notebook)
> increments the "Power-Off_Retract_Count" on each suspend-to-RAM opera=
tion.
> It does not do any double spin-up/spin-down things though.
>=20
> 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 is=
sued?

Thanks.

--=20
tejun