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Add tunable to allow changing micro ZAP's max size

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This change turns `MZAP_MAX_BLKSZ` into a `ZFS_MODULE_PARAM()` called
`zap_micro_max_size`. As a result, we can experiment with different
micro ZAP sizes to improve directory size scaling.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Co-authored-by: Mateusz Piotrowski <mateuszpiotrowski@klarasystems.com>
Co-authored-by: Toomas Soome <toomas.soome@klarasystems.com>
Signed-off-by: Mateusz Piotrowski <mateuszpiotrowski@klarasystems.com>
Sponsored-by: Wasabi Technology, Inc.
Closes #14292
This commit is contained in:
Mateusz Piotrowski
2023-01-10 22:41:54 +01:00
committed by GitHub
parent 1f19826c9a
commit a4b21eadec
3 changed files with 14 additions and 3 deletions
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man/man4/zfs.4
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@@ -15,7 +15,7 @@
.\" own identifying information:
.\" Portions Copyright [yyyy] [name of copyright owner]
.\"
.Dd November 9, 2022
.Dd December 21, 2022
.Dt ZFS 4
.Os
.
@@ -496,6 +496,10 @@ prefetch the entire object (all leaf blocks).
However, this is limited by
.Sy dmu_prefetch_max .
.
.It Sy zap_micro_max_size Ns = Ns Sy 131072 Ns B Po 128 KiB Pc Pq int
Maximum micro ZAP size.
A micro ZAP is upgraded to a fat ZAP, once it grows beyond the specified size.
.
.It Sy zfetch_array_rd_sz Ns = Ns Sy 1048576 Ns B Po 1 MiB Pc Pq u64
If prefetching is enabled, disable prefetching for reads larger than this size.
.