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