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Refactor Log Size Limit

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Original Log Size Limit implementation blocked all writes in case of
limit reached until the TXG is committed and the log is freed.  It
caused huge delays and following speed spikes in application writes.

This implementation instead smoothly throttles writes, using exactly
the same mechanism as used for dirty data.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: jxdking <lostking2008@hotmail.com>
Signed-off-by: Alexander Motin <mav@FreeBSD.org>
Sponsored-By: iXsystems, Inc.
Issue #12284
Closes #13476
This commit is contained in:
Alexander Motin
2022-05-24 12:46:35 -04:00
committed by GitHub
parent f375b23c02
commit 84d0a03f3e
5 changed files with 54 additions and 34 deletions
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include/sys/dmu_tx.h
+1 -1
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@@ -124,8 +124,8 @@ typedef struct dmu_tx_stats {
kstat_named_t dmu_tx_dirty_throttle;
kstat_named_t dmu_tx_dirty_delay;
kstat_named_t dmu_tx_dirty_over_max;
kstat_named_t dmu_tx_wrlog_over_max;
kstat_named_t dmu_tx_dirty_frees_delay;
kstat_named_t dmu_tx_wrlog_delay;
kstat_named_t dmu_tx_quota;
} dmu_tx_stats_t;