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Make metaslab_aliquot a module parameter.

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This seems generally useful. metaslab_aliquot is the ZFS allocation
granularity, which is roughly equivalent to what is called the stripe
size in traditional RAID arrays. It seems relevant to performance
tuning.

Signed-off-by: Etienne Dechamps <etienne@edechamps.fr>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Etienne Dechamps
2015-05-10 16:40:20 +01:00
committed by Brian Behlendorf
parent e8fe6684a5
commit 99b14de421
2 changed files with 18 additions and 1 deletions
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module/zfs/metaslab.c
+4 -1
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@@ -59,7 +59,7 @@
* operation, we will try to write this amount of data to a top-level vdev
* before moving on to the next one.
*/
uint64_t metaslab_aliquot = 512ULL << 10;
unsigned long metaslab_aliquot = 512 << 10;
uint64_t metaslab_gang_bang = SPA_MAXBLOCKSIZE + 1; /* force gang blocks */
@@ -2707,6 +2707,7 @@ metaslab_check_free(spa_t *spa, const blkptr_t *bp)
}
#if defined(_KERNEL) && defined(HAVE_SPL)
module_param(metaslab_aliquot, ulong, 0644);
module_param(metaslab_debug_load, int, 0644);
module_param(metaslab_debug_unload, int, 0644);
module_param(metaslab_preload_enabled, int, 0644);
@@ -2717,6 +2718,8 @@ module_param(metaslab_fragmentation_factor_enabled, int, 0644);
module_param(metaslab_lba_weighting_enabled, int, 0644);
module_param(metaslab_bias_enabled, int, 0644);
MODULE_PARM_DESC(metaslab_aliquot,
"allocation granularity (a.k.a. stripe size)");
MODULE_PARM_DESC(metaslab_debug_load,
"load all metaslabs when pool is first opened");
MODULE_PARM_DESC(metaslab_debug_unload,