From: Tejun Heo <htejun@gmail.com>
To: Jeff Garzik <jeff@garzik.org>
Cc: Kristen Carlson Accardi <kristen.c.accardi@intel.com>,
James.Bottomley@steeleye.com, linux-scsi@vger.kernel.org,
akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
linux-ide@vger.kernel.org, edwintorok@gmail.com, axboe@kernel.dk
Subject: Re: [patch 2/4] Expose Power Management Policy option to users
Date: Tue, 31 Jul 2007 15:27:34 +0900 [thread overview]
Message-ID: <46AED656.8070407@gmail.com> (raw)
In-Reply-To: <46AE12B6.6090408@garzik.org>
Jeff Garzik wrote:
> Any chance the SCSI peeps could ACK this, and then let me include it in
> the ALPM patchset in the libata tree?
ATA link PS is pretty complex with HIPM, DIPM and AHCI ALPM. I'm not
sure whether this three level knob would be sufficient. It might be
good enough if we're gonna develop extensive in-kernel black/white list
specifying which method works on which combination but my gut tells me
that it's best left to userland (probably in the form of per-notebook PS
profile).
Adding to the fun, there are quite a few broken devices out there which
act weirdly when link PS actions are taken.
Also, I generally don't think AHCI ALPM is a good idea. It doesn't have
'cool down' period before entering PS state which unnecessarily hampers
performance and might increase chance of device malfunction.
So, mild NACK from me.
--
tejun
next prev parent reply other threads:[~2007-07-31 6:27 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20070705194909.337398431@intel.com>
2007-07-05 20:05 ` [patch 1/4] Store interrupt value Kristen Carlson Accardi
2007-08-01 8:18 ` Tejun Heo
2007-08-01 14:01 ` Jeff Garzik
2007-08-01 21:18 ` Kristen Carlson Accardi
2007-07-05 20:05 ` [patch 2/4] Expose Power Management Policy option to users Kristen Carlson Accardi
2007-07-09 19:36 ` Pavel Machek
2007-07-11 16:51 ` Kristen Carlson Accardi
2007-07-30 16:32 ` Jeff Garzik
2007-07-31 6:27 ` Tejun Heo [this message]
2007-07-31 14:16 ` Arjan van de Ven
2007-07-31 14:45 ` Tejun Heo
2007-07-31 16:15 ` Arjan van de Ven
2007-07-31 18:29 ` Tejun Heo
2007-08-01 9:23 ` Tejun Heo
2007-08-01 16:31 ` Kristen Carlson Accardi
2007-08-01 21:16 ` Kristen Carlson Accardi
2007-08-09 16:10 ` Kristen Carlson Accardi
2007-07-31 16:18 ` Kristen Carlson Accardi
2007-07-31 17:48 ` Tejun Heo
2007-07-31 20:24 ` Kristen Carlson Accardi
2007-08-01 3:20 ` Tejun Heo
2007-07-31 14:58 ` Tejun Heo
2007-07-31 14:18 ` James Bottomley
2007-08-01 16:53 ` Matthew Wilcox
2007-08-01 17:06 ` James Bottomley
2007-07-31 16:30 ` Kristen Carlson Accardi
2007-07-31 18:02 ` Tejun Heo
2007-07-31 19:58 ` Kristen Carlson Accardi
2007-08-01 3:24 ` Tejun Heo
2007-08-01 15:52 ` Kristen Carlson Accardi
2007-08-01 21:07 ` Kristen Carlson Accardi
2007-07-05 20:05 ` [patch 3/4] Enable link power management for ata drivers Kristen Carlson Accardi
2007-07-05 22:33 ` Andrew Morton
2007-07-05 22:37 ` Andrew Morton
2007-07-06 0:01 ` Jeff Garzik
2007-07-06 0:02 ` Jeff Garzik
2007-07-06 0:17 ` Andrew Morton
2007-07-06 0:00 ` Jeff Garzik
2007-08-01 8:27 ` Tejun Heo
2007-08-01 9:45 ` edwintorok
2007-08-01 21:11 ` Kristen Carlson Accardi
2007-08-02 5:27 ` Tejun Heo
2007-07-05 20:05 ` [patch 4/4] Enable Aggressive Link Power management for AHCI controllers Kristen Carlson Accardi
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