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metaslab: tuneable to better control force ganging

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metaslab_force_ganging isn't enough to actually force ganging, because
it still only forces 3% of the time. This adds
metaslab_force_ganging_pct so we can configure how often to force
ganging.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rob Norris <rob.norris@klarasystems.com>
Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.
Closes #15088
This commit is contained in:
Rob N
2023-07-22 04:52:32 +10:00
committed by Brian Behlendorf
parent 81be809a25
commit 685ae4429f
2 changed files with 18 additions and 3 deletions
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man/man4/zfs.4
+6 -1
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@@ -15,7 +15,7 @@
.\" own identifying information:
.\" Portions Copyright [yyyy] [name of copyright owner]
.\"
.Dd January 10, 2023
.Dd July 21, 2023
.Dt ZFS 4
.Os
.
@@ -239,6 +239,11 @@ relative to the pool.
Make some blocks above a certain size be gang blocks.
This option is used by the test suite to facilitate testing.
.
.It Sy metaslab_force_ganging_pct Ns = Ns Sy 3 Ns % Pq uint
For blocks that could be forced to be a gang block (due to
.Sy metaslab_force_ganging ) ,
force this many of them to be gang blocks.
.
.It Sy zfs_ddt_zap_default_bs Ns = Ns Sy 15 Po 32 KiB Pc Pq int
Default DDT ZAP data block size as a power of 2. Note that changing this after
creating a DDT on the pool will not affect existing DDTs, only newly created