svn commit: r256886 - head/share/man/man4

[Alexander Motin]

Author: mav
Date: Tue Oct 22 11:56:46 2013
New Revision: 256886
URL: http://svnweb.freebsd.org/changeset/base/256886

Log:
  Update ahci(4), respecting recent driver changes.

Modified:
  head/share/man/man4/ahci.4

Modified: head/share/man/man4/ahci.4
==============================================================================
--- head/share/man/man4/ahci.4	Tue Oct 22 10:40:26 2013	(r256885)
+++ head/share/man/man4/ahci.4	Tue Oct 22 11:56:46 2013	(r256886)
@@ -1,4 +1,4 @@
-.\" Copyright (c) 2009-2012 Alexander Motin <mav at FreeBSD.org>
+.\" Copyright (c) 2009-2013 Alexander Motin <mav at FreeBSD.org>
 .\" All rights reserved.
 .\"
 .\" Redistribution and use in source and binary forms, with or without
@@ -24,7 +24,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd July 25, 2012
+.Dd October 22, 2013
 .Dt AHCI 4
 .Os
 .Sh NAME
@@ -57,9 +57,9 @@ controls Message Signaled Interrupts (MS
 .It 0
 MSI disabled;
 .It 1
-single MSI vector used, if supported (default);
+single MSI vector used, if supported;
 .It 2
-multiple MSI vectors used, if supported;
+multiple MSI vectors used, if supported (default);
 .El
 .It Va hint.ahci. Ns Ar X Ns Va .ccc
 controls Command Completion Coalescing (CCC) usage by the specified controller.
@@ -68,6 +68,11 @@ for interrupt, if there are some more re
 CCC reduces number of context switches on systems with many parallel requests,
 but it can decrease disk performance on some workloads due to additional
 command latency.
+.It Va hint.ahci. Ns Ar X Ns Va .direct
+controls whether the driver should use direct command completion from
+interrupt thread(s), or queue them to CAM completion threads.
+Default value depends on number of MSI interrupts supported and number of
+implemented SATA ports.
 .It Va hint.ahcich. Ns Ar X Ns Va .pm_level
 controls SATA interface Power Management for the specified channel,
 allowing some power to be saved at the cost of additional command