da.4: Add some sysctl descriptions
Add descriptions for the following sysctl's: - kern.cam.da.default_softtimeout - kern.cam.da.disable_wp_protection - kern.cam.da.enable_biospeedup - kern.cam.da.enable_uma_ccbs - kern.cam.da.poll_period - kern.cam.da.send_ordered While here, fix some mandocs warnings. PR: 258727 Reported by: Felix Johnson <felix dot the dot red at gmail dot com> Reviewed by: debdrup, pauamma, gbe MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D32278
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@ -25,7 +25,7 @@
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.\"
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.\" $FreeBSD$
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.\"
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.Dd December 20, 2017
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.Dd September 10, 2022
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.Dt DA 4
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.Os
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.Sh NAME
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@ -133,6 +133,36 @@ variables and
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.Xr loader 8
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tunables:
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.Bl -tag -width 12
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.It Va kern.cam.da.default_softtimeout
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Soft I/O timeout (ms). The default is 0.
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Attempting to set this value to a
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time span longer than
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.It kern.cam.da.default_timeout
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will return
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.Dv EINVAL .
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.It Va kern.cam.da.default_timeout
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This variable determines how long the
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.Nm
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driver will wait before timing out an outstanding command.
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The units for this value are seconds, and the default is currently 60
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seconds.
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.It Va kern.cam.da.disable_wp_protection
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Disable detection of write-protected disks.
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Default is disabled.
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.Po
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detection of write-protected disks is enabled
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.Pc .
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.It Va kern.cam.da.enable_biospeedup
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Enable
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.Dv BIO_SPEEDUP
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processing.
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Default is enabled.
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.It Va kern.cam.da.enable_uma_ccbs
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Use UMA for CCBs.
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Default is enabled.
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.It Va kern.cam.da.poll_period
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Media polling period in seconds.
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Default is 3 seconds.
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.It Va kern.cam.da.retry_count
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This variable determines how many times the
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.Nm
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@ -142,19 +172,20 @@ the
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.Nm
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driver dump routine.
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This value currently defaults to 4.
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.It Va kern.cam.da.default_timeout
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This variable determines how long the
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.It Va kern.cam.da.send_ordered
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Send Ordered Tags.
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On shutdown, step through all the
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.Nm
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driver will wait before timing out an outstanding command.
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The units for this value are seconds, and the default is currently 60
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seconds.
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peripheral drivers, and if the device is still open,
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sync the disk to physical media.
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Default is enabled.
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.It Va kern.cam.sort_io_queue
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.It Va kern.cam.da. Ns Ar X Ns Va .sort_io_queue
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.It Va kern.cam.da . Ns Ar X Ns Va .sort_io_queue
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These variables determine whether request queue should be sorted trying
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to optimize head seeks.
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Set to 1 to enable sorting, 0 to disable, -1 to leave it as-is.
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The default is sorting enabled for HDDs and disabled for SSDs.
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.It Va kern.cam.da. Ns Ar X Ns Va .delete_method
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.It Va kern.cam.da . Ns Ar X Ns Va .delete_method
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This variable specifies method to handle BIO_DELETE requests:
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.Bl -tag -width "ATA_TRIM"
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.It ATA_TRIM
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@ -170,7 +201,7 @@ WRITE SAME(10) command without UNMAP flag,
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.It DISABLE
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disable BIO_DELETE support.
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.El
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.It Va kern.cam.da. Ns Ar X Ns Va .minimum_cmd_size
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.It Va kern.cam.da . Ns Ar X Ns Va .minimum_cmd_size
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This variable determines what the minimum READ/WRITE CDB size is for a
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given
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.Nm
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