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Expose zfetch_max_idistance tunable #11038

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Oct 13, 2020
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Expose zfetch_max_idistance tunable #11038

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15 changes: 13 additions & 2 deletions man/man5/zfs-module-parameters.5
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Original file line number Diff line number Diff line change
Expand Up @@ -827,9 +827,20 @@ Default value: \fB1,048,576\fR.
\fBzfetch_max_distance\fR (uint)
.ad
.RS 12n
Max bytes to prefetch per stream (default 8MB).
Max bytes to prefetch per stream.
.sp
Default value: \fB8,388,608\fR.
Default value: \fB8,388,608\fR (8MB).
.RE

.sp
.ne 2
.na
\fBzfetch_max_idistance\fR (uint)
.ad
.RS 12n
Max bytes to prefetch indirects for per stream.
.sp
Default vaule: \fB67,108,864\fR (64MB).
.RE

.sp
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5 changes: 3 additions & 2 deletions module/os/freebsd/zfs/sysctl_os.c
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Expand Up @@ -300,8 +300,9 @@ SYSCTL_UINT(_vfs_zfs_zfetch, OID_AUTO, max_distance, CTLFLAG_RWTUN,

/* max bytes to prefetch indirects for per stream (default 64MB) */
extern uint32_t zfetch_max_idistance;
SYSCTL_UINT(_vfs_zfs_prefetch, OID_AUTO, max_idistance, CTLFLAG_RWTUN,
&zfetch_max_idistance, 0, "Max bytes to prefetch indirects for per stream");
SYSCTL_UINT(_vfs_zfs_zfetch, OID_AUTO, max_idistance, CTLFLAG_RWTUN,
&zfetch_max_idistance, 0,
"Max bytes to prefetch indirects for per stream (LEGACY)");

/* dsl_pool.c */

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5 changes: 4 additions & 1 deletion module/zfs/dmu_zfetch.c
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Expand Up @@ -457,7 +457,10 @@ ZFS_MODULE_PARAM(zfs_prefetch, zfetch_, min_sec_reap, UINT, ZMOD_RW,
"Min time before stream reclaim");

ZFS_MODULE_PARAM(zfs_prefetch, zfetch_, max_distance, UINT, ZMOD_RW,
"Max bytes to prefetch per stream (default 8MB)");
"Max bytes to prefetch per stream");

ZFS_MODULE_PARAM(zfs_prefetch, zfetch_, max_idistance, UINT, ZMOD_RW,
"Max bytes to prefetch indirects for per stream");

ZFS_MODULE_PARAM(zfs_prefetch, zfetch_, array_rd_sz, ULONG, ZMOD_RW,
"Number of bytes in a array_read");
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