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| author | Alexander Motin <mav@FreeBSD.org> | 2014-10-22 08:54:10 +0000 |
|---|---|---|
| committer | Alexander Motin <mav@FreeBSD.org> | 2014-10-22 08:54:10 +0000 |
| commit | 4f8244bbf74df455d7e9aab2217aa346c3f88f08 (patch) | |
| tree | e59f2bc5f217ac055a2c782b0c49d1e213c42972 /share/man/man4/ada.4 | |
| parent | c61ee529ffbe634c1d29dfa4a7c722783dc3307a (diff) | |
| download | src-4f8244bbf74df455d7e9aab2217aa346c3f88f08.tar.gz src-4f8244bbf74df455d7e9aab2217aa346c3f88f08.zip | |
Document sort_io_queue sysctls/tunables.
MFC after: 1 week
Notes
Notes:
svn path=/head/; revision=273457
Diffstat (limited to 'share/man/man4/ada.4')
| -rw-r--r-- | share/man/man4/ada.4 | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/share/man/man4/ada.4 b/share/man/man4/ada.4 index 10897cf0b0bd..792d8e61a9a8 100644 --- a/share/man/man4/ada.4 +++ b/share/man/man4/ada.4 @@ -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 |