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Update zfs module parameters man5

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Update zfs module parameters man5 with missing parameter details
for multiple tunings.

Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov>
Signed-off-by: Alex Braunegg <alex.braunegg@gmail.com>
Closes #6785
This commit is contained in:
abraunegg 2017-10-31 07:15:10 +11:00 committed by Brian Behlendorf
parent f4ae39a19d
commit ca85d69097
1 changed files with 41 additions and 20 deletions
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61
man/man5/zfs-module-parameters.5
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@ -12,7 +12,7 @@
.\" CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your
.\" own identifying information:
.\" Portions Copyright [yyyy] [name of copyright owner]
.TH ZFS-MODULE-PARAMETERS 5 "Sept 28, 2017"
.TH ZFS-MODULE-PARAMETERS 5 "Oct 28, 2017"
.SH NAME
zfs\-module\-parameters \- ZFS module parameters
.SH DESCRIPTION
@ -486,10 +486,11 @@ Default value: \fB10\fR.
\fBzfs_arc_grow_retry\fR (int)
.ad
.RS 12n
After a memory pressure event the ARC will wait this many seconds before trying
to resume growth
If set to a non zero value, it will replace the arc_grow_retry value with this value.
The arc_grow_retry value (default 5) is the number of seconds the ARC will wait before
trying to resume growth after a memory pressure event.
.sp
Default value: \fB5\fR.
Default value: \fB0\fR.
.RE
.sp
@ -520,6 +521,20 @@ the ARC to shrink without memory pressure to induce shrinking.
Default value: \fB0\fR.
.RE
.sp
.ne 2
.na
\fBzfs_arc_meta_adjust_restarts\fR (ulong)
.ad
.RS 12n
The number of restart passes to make while scanning the ARC attempting
the free buffers in order to stay below the \fBzfs_arc_meta_limit\fR.
This value should not need to be tuned but is available to facilitate
performance analysis.
.sp
Default value: \fB4096\fR.
.RE
.sp
.ne 2
.na
@ -585,15 +600,15 @@ Default value: \fB10,000\fR.
.sp
.ne 2
.na
\fBzfs_arc_meta_adjust_restarts\fR (ulong)
\fBzfs_arc_meta_strategy\fR (int)
.ad
.RS 12n
The number of restart passes to make while scanning the ARC attempting
the free buffers in order to stay below the \fBzfs_arc_meta_limit\fR.
This value should not need to be tuned but is available to facilitate
performance analysis.
Define the strategy for ARC meta data buffer eviction (meta reclaim strategy).
A value of 0 (META_ONLY) will evict only the ARC meta data buffers.
A value of 1 (BALANCED) indicates that additional data buffers may be evicted if
that is required to in order to evict the required number of meta data buffers.
.sp
Default value: \fB4096\fR.
Default value: \fB1\fR.
.RE
.sp
@ -602,9 +617,10 @@ Default value: \fB4096\fR.
\fBzfs_arc_min\fR (ulong)
.ad
.RS 12n
Min arc size
Min arc size of ARC in bytes. If set to 0 then arc_c_min will default to
consuming the larger of 32M or 1/32 of total system memory.
.sp
Default value: \fB100\fR.
Default value: \fB0\fR.
.RE
.sp
@ -661,9 +677,12 @@ Default value: \fB8\fR.
\fBzfs_arc_p_min_shift\fR (int)
.ad
.RS 12n
arc_c shift to calc min/max arc_p
If set to a non zero value, this will update arc_p_min_shift (default 4)
with the new value.
arc_p_min_shift is used to shift of arc_c for calculating both min and max
max arc_p
.sp
Default value: \fB4\fR.
Default value: \fB0\fR.
.RE
.sp
@ -694,9 +713,10 @@ Use \fB1\fR for yes (default) and \fB0\fR to disable.
\fBzfs_arc_shrink_shift\fR (int)
.ad
.RS 12n
log2(fraction of arc to reclaim)
If set to a non zero value, this will update arc_shrink_shift (default 7)
with the new value.
.sp
Default value: \fB5\fR.
Default value: \fB0\fR.
.RE
.sp
@ -1778,7 +1798,7 @@ Default value: \fB32\fR.
Historical statistics for the last N txgs will be available in
\fB/proc/spl/kstat/zfs/<pool>/txgs\fR
.sp
Default value: \fB100\fR.
Default value: \fB0\fR.
.RE
.sp
@ -1820,8 +1840,8 @@ Default value: \fB16\fR (effectively 65536).
\fBzfs_vdev_cache_max\fR (int)
.ad
.RS 12n
Inflate reads small than this value to meet the \fBzfs_vdev_cache_bshift\fR
size.
Inflate reads smaller than this value to meet the \fBzfs_vdev_cache_bshift\fR
size (default 64k).
.sp
Default value: \fB16384\fR.
.RE
@ -1928,7 +1948,8 @@ Default value: \fB32,768\fR.
\fBzfs_vdev_scheduler\fR (charp)
.ad
.RS 12n
Set the Linux I/O scheduler on whole disk vdevs to this scheduler
Set the Linux I/O scheduler on whole disk vdevs to this scheduler. Valid options
are noop, cfq, bfq & deadline
.sp
Default value: \fBnoop\fR.
.RE