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Message-ID: <20061121230744.GD1995@elf.ucw.cz> Date: Wed, 22 Nov 2006 00:07:44 +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! > >>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... > > I think this has been discussed in linux-ide recently but just to add my > 2 cents. ALPE and ASP can cause quite some problems. Many devices > don't implement link powermanagement mode properly and some locks up Ok, so it needs to be optional :-). I played with the code a little bit, but did not find combination that both worked and saved power :-(. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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