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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
Download Patch File Download Diff File Expand all files Collapse all files
module/zfs/txg.c
+4 -3
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@@ -517,7 +517,8 @@ txg_sync_thread(void *arg)
clock_t timeout = zfs_txg_timeout * hz;
clock_t timer;
uint64_t txg;
txg_stat_t *ts;
uint64_t dirty_min_bytes =
zfs_dirty_data_max * zfs_dirty_data_sync_percent / 100;
/*
* We sync when we're scanning, there's someone waiting
@@ -529,7 +530,7 @@ txg_sync_thread(void *arg)
!tx->tx_exiting && timer > 0 &&
tx->tx_synced_txg >= tx->tx_sync_txg_waiting &&
!txg_has_quiesced_to_sync(dp) &&
dp->dp_dirty_total < zfs_dirty_data_sync) {
dp->dp_dirty_total < dirty_min_bytes) {
dprintf("waiting; tx_synced=%llu waiting=%llu dp=%p\n",
tx->tx_synced_txg, tx->tx_sync_txg_waiting, dp);
txg_thread_wait(tx, &cpr, &tx->tx_sync_more_cv, timer);
@@ -561,7 +562,7 @@ txg_sync_thread(void *arg)
tx->tx_quiesced_txg = 0;
tx->tx_syncing_txg = txg;
DTRACE_PROBE2(txg__syncing, dsl_pool_t *, dp, uint64_t, txg);
ts = spa_txg_history_init_io(spa, txg, dp);
txg_stat_t *ts = spa_txg_history_init_io(spa, txg, dp);
cv_broadcast(&tx->tx_quiesce_more_cv);
dprintf("txg=%llu quiesce_txg=%llu sync_txg=%llu\n",