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Update ahci(4), respecting recent driver changes.

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This commit is contained in:
Alexander Motin 2013-10-22 11:56:46 +00:00
parent 9e8bd2acf2
commit fdee5abcee
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=256886
1 changed files with 9 additions and 4 deletions
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13
share/man/man4/ahci.4
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@ -1,4 +1,4 @@
.\" Copyright (c) 2009-2012 Alexander Motin <mav@FreeBSD.org>
.\" Copyright (c) 2009-2013 Alexander Motin <mav@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 (MSI) usage by the specified controller.
.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 requests present on controller queue.
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