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MFC r273457: Document sort_io_queue sysctls/tunables.

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mav 2014-10-29 00:27:02 +00:00
parent 928386888b
commit f3c02a878d
2 changed files with 16 additions and 2 deletions
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9
share/man/man4/ada.4
View File

@ -25,7 +25,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd September 21, 2014
.Dd October 22, 2014
.Dt ADA 4
.Os
.Sh NAME
@ -123,6 +123,13 @@ seconds.
This variable determines whether to spin-down disks when shutting down.
Set to 1 to enable spin-down, 0 to disable.
The default is currently enabled.
.It Va kern.cam.sort_io_queue
.It Va kern.cam.ada. Ns Ar X Ns Va .sort_io_queue
.Pp
These variables determine whether request queue should be sorted trying
to optimize head seeks.
Set to 1 to enable sorting, 0 to disable, -1 to leave it as-is.
The default is sorting enabled for HDDs and disabled SSDs.
.It Va kern.cam.ada.read_ahead
.It Va kern.cam.ada. Ns Ar X Ns Va .read_ahead
.It Va kern.cam.ada.write_cache

9
share/man/man4/da.4
View File

@ -25,7 +25,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd February 8, 2012
.Dd October 22, 2014
.Dt DA 4
.Os
.Sh NAME
@ -150,6 +150,13 @@ This variable determines how long the
driver will wait before timing out an outstanding command.
The units for this value are seconds, and the default is currently 60
seconds.
.It Va kern.cam.sort_io_queue
.It Va kern.cam.da. Ns Ar X Ns Va .sort_io_queue
.Pp
These variables determine whether request queue should be sorted trying
to optimize head seeks.
Set to 1 to enable sorting, 0 to disable, -1 to leave it as-is.
The default is sorting enabled for HDDs and disabled for SSDs.
.It kern.cam.da.%d.minimum_cmd_size
.Pp
This variable determines what the minimum READ/WRITE CDB size is for a