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Date: Mon, 4 Jul 2005 09:30:32 +0200
From: Jens Axboe <axboe@suse.de>
To: Arjan van de Ven <arjan@infradead.org>
Cc: Alejandro Bonilla <abonilla@linuxwireless.org>,
       Lenz Grimmer <lenz@grimmer.com>, Jesper Juhl <jesper.juhl@gmail.com>,
       Dave Hansen <dave@sr71.net>, Henrik Brix Andersen <brix@gentoo.org>,
       hdaps-devel@lists.sourceforge.net,
       LKML List <linux-kernel@vger.kernel.org>
Subject: Re: IBM HDAPS things are looking up (was: Re: [Hdaps-devel] Re: [ltp] IBM HDAPS Someone interested? (Accelerometer))
Message-ID: <20050704073031.GI1444@suse.de>
References: <9a8748490507031832546f383a@mail.gmail.com> <42C8D06C.2020608@grimmer.com> <20050704061713.GA1444@suse.de> <42C8C978.4030409@linuxwireless.org> <20050704063741.GC1444@suse.de> <1120461401.3174.10.camel@laptopd505.fenrus.org> <20050704072231.GG1444@suse.de> <1120462037.3174.25.camel@laptopd505.fenrus.org>
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On Mon, Jul 04 2005, Arjan van de Ven wrote:
> 
> > 
> > Yeah, that likely needs a little help from the ide driver. If you force
> > a spindown, you will effectively have parked the head for as long as the
> > spindown + spinup takes. That could turn out to be enough, it will take
> > more than 1-2 seconds anyways.
> 
> I doubt it; laptop disks seem to be optimized for spinning up/down fast
> (for powersaving reasons) so while for normal disks I'd agree with you,
> for laptop disks I'm far less sure.

It isn't too pretty to rely on such unreliable timing anyways. I'm not
too crazy about spinning the disk down either, it's useless wear
compared to just parking the head.

-- 
Jens Axboe