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Message-ID: <84144f02050707062846365ea9@mail.gmail.com>
Date: Thu, 7 Jul 2005 16:28:39 +0300
From: Pekka Enberg <penberg@gmail.com>
Reply-To: Pekka Enberg <penberg@gmail.com>
To: Jens Axboe <axboe@suse.de>
Subject: Re: Head parking (was: IBM HDAPS things are looking up)
Cc: Lenz Grimmer <lenz@grimmer.com>, Arjan van de Ven <arjan@infradead.org>,
       Alejandro Bonilla <abonilla@linuxwireless.org>,
       Jesper Juhl <jesper.juhl@gmail.com>, Dave Hansen <dave@sr71.net>,
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On 7/7/05, Jens Axboe <axboe@suse.de> wrote:
> Did it say 'head parked'? If the drive is idle, you wont hear anything.
> Laptop drives auto-park really quickly themselves. A time ./park
> /dev/hda should tell you whether it needed to park or not, if it
> executes faster than a few hundred ms it was already parked.

Aah, you're right.

haji tmp # time ./a.out /dev/hda
head parked

real    0m0.421s
user    0m0.000s
sys     0m0.001s

Immediately after that:

haji tmp # time ./a.out /dev/hda
head parked

real    0m0.001s
user    0m0.000s
sys     0m0.001s

And then I do bit of disk reads and I get this again:

haji tmp # time ./a.out /dev/hda
head parked

real    0m0.429s
user    0m0.001s
sys     0m0.001s

So looks like it works for me too.

                                Pekka