svn commit: r194890 - head/share/man/man4

Alexander Motin mav at
Wed Jun 24 19:25:48 UTC 2009

Author: mav
Date: Wed Jun 24 19:25:47 2009
New Revision: 194890

  Document new hint.atapci.X.msi and hint.ata.X.pm_level tunables.


Modified: head/share/man/man4/ata.4
--- head/share/man/man4/ata.4	Wed Jun 24 19:16:48 2009	(r194889)
+++ head/share/man/man4/ata.4	Wed Jun 24 19:25:47 2009	(r194890)
@@ -27,7 +27,7 @@
 .\" $FreeBSD$
-.Dd October 4, 2008
+.Dd June 24, 2009
 .Dt ATA 4
@@ -93,6 +93,24 @@ set to 1 for DMA access, 0 for PIO (defa
 set to 1 to enable Write Caching, 0 to disable (default is enabled).
 can cause data loss on power failures and crashes.
+.It Va hint.atapci.X.msi
+set to 1 to allow Message Signalled Interrupts (MSI) to be used by
+specified PCI ATA controller, if supported.
+.It Va hint.ata.X.pm_level
+controls SATA interface Power Management for specified channel,
+allowing to save some power by the cost of additional command latency.
+Possible values:
+.Bl -tag -compact
+.It 0
+interface Power Management is disabled, default value.
+.It 1
+device is allowed to initiate PM state change, host is passive.
+.It 2
+host initiates PARTIAL PM state transition every time port becomes idle.
+.It 3
+host initiates SLUMBER PM state transition every time port becomes idle.
+Modes 2 and 3 are implemented only for AHCI driver now.

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