Date: Thu, 18 Jun 2009 16:31:18 +0300 From: Alexander Motin <mav@FreeBSD.org> To: Alexander Leidinger <Alexander@Leidinger.net> 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: <4A3A41A6.3080404@FreeBSD.org> In-Reply-To: <20090618152740.1806764x8heftjv0@webmail.leidinger.net> References: <200904292117.n3TLHIpt093110@svn.freebsd.org> <20090617150015.18455ggwluk5bcgs@webmail.leidinger.net> <4A38EB41.2080206@FreeBSD.org> <20090618152740.1806764x8heftjv0@webmail.leidinger.net>
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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. -- Alexander Motin
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