Date: Thu, 18 Jun 2009 16:10:14 +0200 From: Alexander Leidinger <Alexander@Leidinger.net> To: Alexander Motin <mav@FreeBSD.org> Cc: svn-src-head@FreeBSD.org, svn-src-all@FreeBSD.org, src-committers@FreeBSD.org Subject: Re: svn commit: r191674 - in head/sys/dev/ata: . chipsets Message-ID: <20090618161014.20533fy9f9hs0ukg@webmail.leidinger.net> In-Reply-To: <4A3A41A6.3080404@FreeBSD.org> References: <200904292117.n3TLHIpt093110@svn.freebsd.org> <20090617150015.18455ggwluk5bcgs@webmail.leidinger.net> <4A38EB41.2080206@FreeBSD.org> <20090618152740.1806764x8heftjv0@webmail.leidinger.net> <4A3A41A6.3080404@FreeBSD.org>
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Quoting Alexander Motin <mav@FreeBSD.org> (from Thu, 18 Jun 2009 16:31:18 +0300): > Alexander Leidinger wrote: >> Quoting Alexander Motin <mav@FreeBSD.org> (from Wed, 17 Jun 2009 >> 16:10:25 +0300): >> >>> Alexander Leidinger wrote: >>>> Quoting Alexander Motin <mav@FreeBSD.org> (from Wed, 29 Apr 2009 >>>> 21:17:18 +0000 (UTC)): >> >>>>> PARTIAL state has up to 100us (50us for me) wakeup latency, but >>>>> for my >>>>> ICH8M saves 0.5W of power per drive. SLUMBER state has up to 10ms >>>>> (3.5ms >>>>> for me) wakeup latency, but saves 0.8W of power. >>>>> >>>>> Modes 2 and 3 are implemented only for AHCI driver now. >>>> >>>> Does this mean it is for SATA devices only, or is this a feature of the >>>> complete controller (ICH5 in my case) and also works with PATA drives? >>> >>> This feature is SATA-specific by definition. AFAIK there is no bus power >>> management in PATA. >> >> What happens if such a setting is made for a pata channel, will the >> system ignore it? The idea of the question is: can I just add those >> hints for all my ata channels on a remote system without getting into >> trouble? > > You can. Nothing happen. It will just set variable that is used only by > SATA and AHCI code. PATA does not use it. Ok, thanks! I'm going to try this now. Bye, Alexander. -- Creativity is no substitute for knowing what you are doing. http://www.Leidinger.net Alexander @ Leidinger.net: PGP ID = B0063FE7 http://www.FreeBSD.org netchild @ FreeBSD.org : PGP ID = 72077137
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