linux-kernel - Re: SATA powersave patches

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Date:	Sun, 12 Nov 2006 18:39:27 +0000
From:	Pavel Machek <pavel@...e.cz>
To:	Tejun Heo <htejun@...il.com>
Cc:	kernel list <linux-kernel@...r.kernel.org>, axboe@...e.de
Subject: Re: SATA powersave patches

Hi!

> >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?
> 
> I haven't updated link powersave patch yet.  Core 
> implementation was agreed on but interface hasn't been 
> decided yet.  Maybe it's about time to add 
> /sys/class/ata_{host|device}/.  So, the patchset is 
> pushed back for the time being.

/sys/class/ata* would probably be ok.

> >Well... things are pretty quiet in that area just 
> >now... So yes.
> 
> If I understood correctly, the high power consumption of 
> ahci controller can be solved by dynamically turning off 
> command processing while the controller is idle, which 
> fits nicely into link powersaving, right?  So, I think 
> full-fledged leveled dynamic PM would be an overkill for 
> this particular problem, but then again, maybe the 

It is single bit, and it should not even need a timeout, AFAICT, so
perhaps we should just fix it (no need for dynamic PM layers). It
probably does not even need to be configurable...

-- 
Thanks for all the (sleeping) penguins.
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