Author: mav Date: Wed Oct 22 08:54:10 2014 New Revision: 273457 URL: https://svnweb.freebsd.org/changeset/base/273457
Log: Document sort_io_queue sysctls/tunables. MFC after: 1 week Modified: head/share/man/man4/ada.4 head/share/man/man4/da.4 Modified: head/share/man/man4/ada.4 ============================================================================== --- head/share/man/man4/ada.4 Wed Oct 22 07:50:19 2014 (r273456) +++ head/share/man/man4/ada.4 Wed Oct 22 08:54:10 2014 (r273457) @@ -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 Modified: head/share/man/man4/da.4 ============================================================================== --- head/share/man/man4/da.4 Wed Oct 22 07:50:19 2014 (r273456) +++ head/share/man/man4/da.4 Wed Oct 22 08:54:10 2014 (r273457) @@ -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 _______________________________________________ svn-src-all@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
