From: Alan <alan@lxorguk.ukuu.org.uk>
To: Jeff Garzik <jeff@garzik.org>
Cc: Pavel Machek <pavel@ucw.cz>, John Fremlin <not@just.any.name>,
kernel list <linux-kernel@vger.kernel.org>,
htejun@gmail.com, jim.kardach@intel.com, ak@suse.de
Subject: Re: AHCI power saving (was Re: Ten hours on X60s)
Date: Mon, 13 Nov 2006 16:11:30 +0000 [thread overview]
Message-ID: <20061113161130.02ba0c74@localhost.localdomain> (raw)
In-Reply-To: <45589008.1080001@garzik.org>
On Mon, 13 Nov 2006 10:32:24 -0500
Jeff Garzik <jeff@garzik.org> wrote:
> Therein lies a key problem. Turning on all of AHCI's aggressive power
> management features DOES save a lot of power. But at the same time, it
> shortens the life of your hard drive, particularly hard drives that are
> really PATA, but have a PATA<->SATA bridge glued on the drive to enable
> connection to SATA controllers.
We already detect PATA over SATA so we can trivially address that (the
knobble check). Similarly we can turn ALPME on using a timer so it kicks
in after long idle periods only, or tie it to laptop mode.
For a laptop type environment with SATA not bridged PATA turning it on is
clearly the right thing to do.
Alan
next prev parent reply other threads:[~2006-11-13 16:09 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <87k639u55l.fsf-genuine-vii@john.fremlin.org>
[not found] ` <20061009215221.GC30702@elf.ucw.cz>
[not found] ` <87ods6loe8.fsf-genuine-vii@john.fremlin.org>
[not found] ` <20061025070920.GG5851@elf.ucw.cz>
[not found] ` <87y7r3xlif.fsf-genuine-vii@john.fremlin.org>
[not found] ` <20061026204655.GA1767@elf.ucw.cz>
[not found] ` <87slgv6ccz.fsf-genuine-vii@john.fremlin.org>
[not found] ` <20061112183614.GA5081@ucw.cz>
[not found] ` <87hcx3adcd.fsf-genuine-vii@john.fremlin.org>
2006-11-13 14:22 ` AHCI power saving (was Re: Ten hours on X60s) Pavel Machek
2006-11-13 15:32 ` Jeff Garzik
2006-11-13 15:37 ` Andi Kleen
2006-11-13 15:48 ` Jeff Garzik
2006-11-13 16:08 ` Valdis.Kletnieks
2006-11-13 17:58 ` Mark Lord
2006-11-13 22:01 ` Pavel Machek
2006-11-14 3:43 ` HD head unloads (was: Re: AHCI power saving) Henrique de Moraes Holschuh
2006-11-14 9:30 ` Jan Engelhardt
2006-11-14 18:06 ` HD head unloads Mark Lord
2006-11-15 10:58 ` Jan Engelhardt
2006-11-16 0:02 ` Jan Engelhardt
2006-11-21 4:40 ` AHCI power saving (was Re: Ten hours on X60s) Tejun Heo
2006-11-21 11:32 ` Pavel Machek
2006-11-13 16:11 ` Alan [this message]
2006-11-13 21:56 ` Pavel Machek
2006-11-14 13:33 ` AHCI power saving John Fremlin
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