Date: Wed, 17 Jun 2009 15:00:15 +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: <20090617150015.18455ggwluk5bcgs@webmail.leidinger.net> In-Reply-To: <200904292117.n3TLHIpt093110@svn.freebsd.org> References: <200904292117.n3TLHIpt093110@svn.freebsd.org>
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Quoting Alexander Motin <mav@FreeBSD.org> (from Wed, 29 Apr 2009 21:17:18 +0000 (UTC)): > Author: mav > Date: Wed Apr 29 21:17:18 2009 > New Revision: 191674 > URL: http://svn.freebsd.org/changeset/base/191674 > > Log: > Add experimental support for SATA interface power management. > Feature is controlled by hint.ata.X.pm_level tunable: > 0 - PM disabled, old behaviour, default. > 1 - device is allowed to initiate PM state change, host is passive. > 2 - host initiates PARTIAL state transition every time port is idle. > 3 - host initiates SLUMBER state transition every time port is idle. Did I miss a man-page update for this? If yes, where is it, I would have expected it in ata(4). > 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? Bye, Alexander. -- BOFH excuse #345: Having to manually track the satellite http://www.Leidinger.net Alexander @ Leidinger.net: PGP ID = B0063FE7 http://www.FreeBSD.org netchild @ FreeBSD.org : PGP ID = 72077137
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