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Don't scale zfs_zevent_len_max by CPU count 

The lower bound for this scaling to too low and the upper bound is too
high.  Use a fixed default length of 512 instead, which is a reasonable
value on any system.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ryan Moeller <ryan@iXsystems.com>
Closes #11822
This commit is contained in:
Ryan Moeller 2021-03-31 13:56:37 -04:00 committed by Tony Hutter
parent 67819ea28d
commit d9bcadc6ba
2 changed files with 5 additions and 9 deletions
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9
man/man5/zfs-module-parameters.5
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@ -14,7 +14,7 @@
.\" 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 "Aug 24, 2020" OpenZFS
.TH ZFS-MODULE-PARAMETERS 5 "Mar 31, 2021" OpenZFS
.SH NAME
zfs\-module\-parameters \- ZFS module parameters
.SH DESCRIPTION
@ -3745,11 +3745,10 @@ Use \fB1\fR for yes and \fB0\fR for no (default).
\fBzfs_zevent_len_max\fR (int)
.ad
.RS 12n
Max event queue length. A value of 0 will result in a calculated value which
increases with the number of CPUs in the system (minimum 64 events). Events
in the queue can be viewed with the \fBzpool events\fR command.
Max event queue length.
Events in the queue can be viewed with the \fBzpool events\fR command.
.sp
Default value: \fB0\fR.
Default value: \fB512\fR.
.RE
.sp

5
module/zfs/fm.c
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@ -70,7 +70,7 @@
#include <sys/time.h>
#include <sys/zfs_ioctl.h>
int zfs_zevent_len_max = 0;
int zfs_zevent_len_max = 512;
int zfs_zevent_cols = 80;
int zfs_zevent_console = 0;
@ -1621,9 +1621,6 @@ fm_init(void)
zevent_len_cur = 0;
zevent_flags = 0;
if (zfs_zevent_len_max == 0)
zfs_zevent_len_max = ERPT_MAX_ERRS * MAX(max_ncpus, 4);
/* Initialize zevent allocation and generation kstats */
fm_ksp = kstat_create("zfs", 0, "fm", "misc", KSTAT_TYPE_NAMED,
sizeof (struct erpt_kstat) / sizeof (kstat_named_t),