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Limit dbuf cache sizes based only on ARC target size by default

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Set the initial max sizes to ULONG_MAX to allow the caches to grow
with the ARC.

Recalculate the metadata cache size on demand so it can adapt, too.

Update descriptions in zfs-module-parameters(5).

Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Matt Ahrens <matt@delphix.com>
Signed-off-by: Ryan Moeller <ryan@iXsystems.com>
Closes #10563 
Closes #10610
This commit is contained in:
Ryan Moeller
2020-07-24 23:38:48 -04:00
committed by GitHub
parent 4fbdb10c7b
commit 8348fac30c
2 changed files with 34 additions and 34 deletions
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man/man5/zfs-module-parameters.5
+10 -12
View File
@@ -32,13 +32,12 @@ Description of the different parameters to the ZFS module.
\fBdbuf_cache_max_bytes\fR (ulong)
.ad
.RS 12n
Maximum size in bytes of the dbuf cache. When \fB0\fR this value will default
to \fB1/2^dbuf_cache_shift\fR (1/32) of the target ARC size, otherwise the
provided value in bytes will be used. The behavior of the dbuf cache and its
associated settings can be observed via the \fB/proc/spl/kstat/zfs/dbufstats\fR
kstat.
Maximum size in bytes of the dbuf cache. The target size is determined by the
MIN versus \fB1/2^dbuf_cache_shift\fR (1/32) of the target ARC size. The
behavior of the dbuf cache and its associated settings can be observed via the
\fB/proc/spl/kstat/zfs/dbufstats\fR kstat.
.sp
Default value: \fB0\fR.
Default value: \fBULONG_MAX\fR.
.RE
.sp
@@ -47,13 +46,12 @@ Default value: \fB0\fR.
\fBdbuf_metadata_cache_max_bytes\fR (ulong)
.ad
.RS 12n
Maximum size in bytes of the metadata dbuf cache. When \fB0\fR this value will
default to \fB1/2^dbuf_cache_shift\fR (1/16) of the target ARC size, otherwise
the provided value in bytes will be used. The behavior of the metadata dbuf
cache and its associated settings can be observed via the
\fB/proc/spl/kstat/zfs/dbufstats\fR kstat.
Maximum size in bytes of the metadata dbuf cache. The target size is
determined by the MIN versus \fB1/2^dbuf_metadata_cache_shift\fR (1/64) of the
target ARC size. The behavior of the metadata dbuf cache and its associated
settings can be observed via the \fB/proc/spl/kstat/zfs/dbufstats\fR kstat.
.sp
Default value: \fB0\fR.
Default value: \fBULONG_MAX\fR.
.RE
.sp