linux-kernel - Re: SATA powersave patches

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Message-ID: <20061106135751.GA13517@elf.ucw.cz>
Date:	Mon, 6 Nov 2006 14:57:51 +0100
From:	Pavel Machek <pavel@....cz>
To:	Tejun Heo <htejun@...il.com>
Cc:	kernel list <linux-kernel@...r.kernel.org>, axboe@...e.de
Subject: Re: SATA powersave patches

Hi!

First, sorry for long reply time. I had too many horses and not enough
time.

> >>Can you check if there is any difference between [D/H]IPS and static? 
> >>ICH6M on my notebook can't do DIPS/HIPS, so I couldn't compare them 
> >>against static.
> >
> >What is D/HIPS? I could not find anything relevant..
> 
> D/HIPS stand for device/host initiated power saving.  These modes use 
> two SATA link powersaving state (partial and slumber).  Static mode 
> simply turns off PHY on unoccupied port using SControl register.  So, if 
> you have an access to a notebook which has a SATA dock which support 
> link powersaving, you can test it by...
> 
> * set link powersaving mode to HIPS/static. (mode 4)
> 
> * w/ device inserted, leave it idle for 15 seconds and record power 
> consumption level (link should be in slumber state).
> 
> * pull out the device, wait for libata to detach the device and record 
> power consumption level (libata should have turned off PHY after 
> detaching the device).
> 
> I wanna know whether there is any difference in the amount of power 
> saved between slumber and off states.

I'm probably doing something wrong, but...

I'm on commit 

commit 9a7b050525f7d70d2ed62affb691b9d4ca2b82d2
tree b8195e5625dc5bad6757b0dddec0dacf416a0779
parent 50c3086de212ce56eaa2bf284586fb021615b5e1
author Tejun Heo <htejun@...il.com> Mon, 16 Oct 2006 07:24:57 +0900
committer Tejun Heo <htejun@...il.com> Mon, 16 Oct 2006 07:24:57 +0900

    [PATCH] sata_sil24: implement PORT_RST

    As DEV_RST (hardreset) sometimes fail to recover the controller
    (especially after PMP DMA CS errata).  In such cases, perform
PORT_RST
    prior to DEV_RST.

    Signed-off-by: Tejun Heo <htejun@...il.com>


(2.6.19-rc1)

and I do not see powersave tunable:

root@amd:/sys/module# ls libata/parameters/
ata_probe_timeout         atapi_enabled hotplug_polling_interval
atapi_dmadir              fua

...how do I pull working version?

> >>So, I think option #1 is the way to go - implementing leveled dynamic 
> >>power management infrastructure and adding support in the block layer. 
> >>What do you think?
> >
> >Would be nice :-).
> 
> So, do you think we're ready for another PM infrastructure update?  :-P

Well... things are pretty quiet in that area just now... So yes.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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