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da.4: Don't document softtimeout

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kern.cam.da.default_softtimeout currently does nothing. It sets a value
in the CCB that SIMs could look at, only none do. Leave it undocumented
until it actually does something. It was introduced to allow a 'soft
recovery' to be started when things were taking too long in the SIM by
not scheduling new I/O, or other measures the SIM knew would help when
it seemed like things were getting 'backed up'. No SIM in the FreeBSD
tree implements this and scsi_da doesn't use it other than to pass it
down, so best remove it from the documentation until it does something.

Sponsored by:		Netflix
Fixes:			53af9c235f
Reviewed by:		gbe
Differential Review:	https://reviews.freebsd.org/D36518
This commit is contained in:
Warner Losh 2022-09-10 10:55:24 -06:00
parent 3be2225fc8
commit e66c6b993e
1 changed files with 0 additions and 7 deletions
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@ -133,13 +133,6 @@ variables and
.Xr loader 8
tunables:
.Bl -tag -width 12
.It Va kern.cam.da.default_softtimeout
Soft I/O timeout (ms). The default is 0.
Attempting to set this value to a
time span longer than
.It kern.cam.da.default_timeout
will return
.Dv EINVAL .
.It Va kern.cam.da.default_timeout
This variable determines how long the
.Nm