From: Tejun Heo <tj@kernel.org>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: Aaron Lu <aaron.lu@intel.com>, Jeff Garzik <jgarzik@pobox.com>,
James Bottomley <James.Bottomley@hansenpartnership.com>,
"Rafael J. Wysocki" <rjw@sisk.pl>, Jeff Wu <jeff.wu@amd.com>,
Aaron Lu <aaron.lwe@gmail.com>,
linux-ide@vger.kernel.org, linux-pm@vger.kernel.org,
linux-scsi@vger.kernel.org, linux-acpi@vger.kernel.org
Subject: Re: [PATCH v9 07/10] block: add a new interface to block events
Date: Sun, 18 Nov 2012 07:05:55 -0800 [thread overview]
Message-ID: <20121118150555.GL7306@mtj.dyndns.org> (raw)
In-Reply-To: <Pine.LNX.4.44L0.1211121432050.31816-100000@netrider.rowland.org>
Hello, Alan.
On Mon, Nov 12, 2012 at 02:34:01PM -0500, Alan Stern wrote:
> It wouldn't do anything for the device, but it would allow the device's
> parent to go to low power in between polls. That's why Aaron at one
> point suggested lengthening the polling interval.
Ah, okay. Entering and leaving suspend even every two seconds may
save noticeable power for some controllers. Does that, tho, mean that
the port would get reset every two seconds? If so (I can't see how
else it would behave), it may not really work. I mean, you would be
spending about ten seconds reinitiaizing everything and then enter
sleep and do it all over again two seconds later, most likely wasting
power in the process. Sounds weird to me. What am I missing?
Thanks.
--
tejun
next prev parent reply other threads:[~2012-11-18 15:05 UTC|newest]
Thread overview: 85+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-09 6:51 [PATCH v9 00/10] ZPODD Patches Aaron Lu
2012-11-09 6:51 ` [PATCH v9 01/10] scsi: sr: support runtime pm Aaron Lu
2012-11-09 6:51 ` [PATCH v9 02/10] ata: zpodd: Add CONFIG_SATA_ZPODD Aaron Lu
2012-11-09 6:51 ` [PATCH v9 03/10] ata: zpodd: identify and init ZPODD devices Aaron Lu
2012-11-12 18:53 ` Tejun Heo
2012-11-14 1:32 ` Aaron Lu
2012-11-18 14:38 ` Tejun Heo
2012-11-19 2:15 ` Aaron Lu
2012-11-09 6:51 ` [PATCH v9 04/10] libata: acpi: move acpi notification code to zpodd Aaron Lu
2012-11-12 18:55 ` Tejun Heo
2012-11-14 1:36 ` Aaron Lu
2012-11-09 6:51 ` [PATCH v9 05/10] libata: separate ATAPI code Aaron Lu
2012-11-12 18:57 ` Tejun Heo
2012-11-13 12:49 ` Aaron Lu
2012-11-18 15:01 ` Tejun Heo
2012-11-19 2:21 ` Aaron Lu
2012-11-19 14:51 ` Tejun Heo
2012-11-09 6:51 ` [PATCH v9 06/10] ata: zpodd: check zero power ready status Aaron Lu
2012-11-12 19:13 ` Tejun Heo
2012-11-13 13:20 ` Aaron Lu
2012-11-14 2:18 ` Aaron Lu
2012-11-18 15:00 ` Tejun Heo
2012-11-19 3:09 ` Aaron Lu
2012-11-19 14:56 ` Tejun Heo
2012-11-19 15:06 ` James Bottomley
2012-11-26 0:33 ` Rafael J. Wysocki
2012-11-26 0:45 ` Aaron Lu
2012-11-26 5:03 ` James Bottomley
2012-11-26 5:09 ` Aaron Lu
2012-11-26 7:32 ` James Bottomley
2012-11-26 8:27 ` Aaron Lu
2012-11-26 13:17 ` James Bottomley
2012-11-26 16:21 ` Alan Stern
2012-11-26 19:15 ` James Bottomley
2012-11-27 1:41 ` Aaron Lu
2012-11-28 0:51 ` Rafael J. Wysocki
2012-11-28 1:39 ` Tejun Heo
2012-11-28 2:24 ` Aaron Lu
2012-11-28 8:56 ` James Bottomley
2012-12-03 8:13 ` Aaron Lu
2012-12-03 8:25 ` James Bottomley
2012-12-03 8:59 ` Aaron Lu
2012-12-03 16:23 ` Tejun Heo
2012-12-03 18:56 ` Jeff Garzik
2012-12-04 5:04 ` Aaron Lu
2012-12-04 12:11 ` James Bottomley
2012-12-07 6:13 ` Aaron Lu
2012-12-10 3:26 ` Aaron Lu
2012-12-11 5:10 ` Tejun Heo
2012-12-18 8:30 ` Aaron Lu
2012-12-20 6:07 ` Aaron Lu
2012-12-25 17:17 ` Tejun Heo
2012-12-26 1:42 ` Aaron Lu
2012-12-28 21:16 ` Tejun Heo
2013-01-04 1:04 ` Aaron Lu
2012-11-30 8:55 ` Aaron Lu
2012-11-30 11:15 ` Rafael J. Wysocki
2012-11-20 6:00 ` Aaron Lu
2012-11-20 8:59 ` Aaron Lu
2012-11-26 0:50 ` Rafael J. Wysocki
2012-11-26 0:48 ` Aaron Lu
2012-11-26 1:03 ` Rafael J. Wysocki
2012-11-26 1:05 ` Aaron Lu
2012-11-26 1:11 ` Rafael J. Wysocki
2012-11-26 1:09 ` Aaron Lu
2012-11-26 1:22 ` Rafael J. Wysocki
2012-11-26 1:22 ` Aaron Lu
2012-11-26 1:17 ` Aaron Lu
2012-11-09 6:51 ` [PATCH v9 07/10] block: add a new interface to block events Aaron Lu
2012-11-12 19:14 ` Tejun Heo
2012-11-12 19:18 ` Alan Stern
2012-11-12 19:21 ` Tejun Heo
2012-11-12 19:34 ` Alan Stern
2012-11-18 15:05 ` Tejun Heo [this message]
2012-11-18 17:41 ` Alan Stern
2012-11-18 21:56 ` Tejun Heo
2012-11-18 21:58 ` Tejun Heo
2012-11-18 23:28 ` Alan Stern
2012-11-18 23:35 ` Tejun Heo
2012-11-19 2:07 ` Alan Stern
2012-11-19 3:21 ` Aaron Lu
2012-11-19 14:50 ` Tejun Heo
2012-11-09 6:52 ` [PATCH v9 08/10] scsi: sr: support (un)block events Aaron Lu
2012-11-09 6:52 ` [PATCH v9 09/10] ata: zpodd: handle power transition of ODD Aaron Lu
2012-11-09 6:52 ` [PATCH v9 10/10] ata: expose pm qos flags to user space for ata device Aaron Lu
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