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OpenZFS 9617 - too-frequent TXG sync causes excessive write inflation

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Porting notes:
* Renamed zfs_dirty_data_sync_pct to zfs_dirty_data_sync_percent and
  changed the type to be consistent with the other dirty module params.
* Updated zfs-module-parameters.5 accordingly.

Authored by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Serapheim Dimitropoulos <serapheim.dimitro@delphix.com>
Reviewed by: Brad Lewis <brad.lewis@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Andrew Stormont <andyjstormont@gmail.com>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Approved by: Robert Mustacchi <rm@joyent.com>
Ported-by: Brian Behlendorf <behlendorf1@llnl.gov>

OpenZFS-issue: https://illumos.org/issues/9617
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/7928f4ba
Closes #7976
This commit is contained in:
Matthew Ahrens
2017-12-12 15:46:58 -08:00
committed by Brian Behlendorf
parent 58c0f374f1
commit dfbe267503
4 changed files with 18 additions and 11 deletions
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module/zfs/dsl_pool.c
+8 -4
View File
@@ -106,9 +106,11 @@ int zfs_dirty_data_max_percent = 10;
int zfs_dirty_data_max_max_percent = 25;
/*
* If there is at least this much dirty data, push out a txg.
* If there's at least this much dirty data (as a percentage of
* zfs_dirty_data_max), push out a txg. This should be less than
* zfs_vdev_async_write_active_min_dirty_percent.
*/
unsigned long zfs_dirty_data_sync = 64 * 1024 * 1024;
int zfs_dirty_data_sync_percent = 20;
/*
* Once there is this amount of dirty data, the dmu_tx_delay() will kick in
@@ -879,10 +881,12 @@ dsl_pool_need_dirty_delay(dsl_pool_t *dp)
{
uint64_t delay_min_bytes =
zfs_dirty_data_max * zfs_delay_min_dirty_percent / 100;
uint64_t dirty_min_bytes =
zfs_dirty_data_max * zfs_dirty_data_sync_percent / 100;
boolean_t rv;
mutex_enter(&dp->dp_lock);
if (dp->dp_dirty_total > zfs_dirty_data_sync)
if (dp->dp_dirty_total > dirty_min_bytes)
txg_kick(dp);
rv = (dp->dp_dirty_total > delay_min_bytes);
mutex_exit(&dp->dp_lock);
@@ -1345,7 +1349,7 @@ module_param(zfs_dirty_data_max_max, ulong, 0444);
MODULE_PARM_DESC(zfs_dirty_data_max_max,
"zfs_dirty_data_max upper bound in bytes");
module_param(zfs_dirty_data_sync, ulong, 0644);
module_param(zfs_dirty_data_sync_percent, int, 0644);
MODULE_PARM_DESC(zfs_dirty_data_sync, "sync txg when this much dirty data");
module_param(zfs_delay_scale, ulong, 0644);