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OpenZFS 9993 - zil writes can get delayed in zio pipeline

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Authored by: George Wilson <george.wilson@delphix.com>
Reviewed by: Prakash Surya <prakash.surya@delphix.com>
Reviewed by: Brad Lewis <brad.lewis@delphix.com>
Reviewed by: Matt Ahrens <matt@delphix.com>
Reviewed by: Tom Caputi <tcaputi@datto.com>
Reviewed by: George Melikov <mail@gmelikov.ru>
Approved by: Dan McDonald <danmcd@joyent.com>
Ported-by: Brian Behlendorf <behlendorf1@llnl.gov>

OpenZFS-issue: https://www.illumos.org/issues/9993
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/2258ad0b
Closes #8185
This commit is contained in:
George Wilson 2018-11-02 17:49:40 -06:00 committed by Brian Behlendorf
parent e63ac16d25
commit 18b14b17c8
1 changed files with 2 additions and 1 deletions
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3
module/zfs/zio.c
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@ -1738,7 +1738,8 @@ zio_taskq_dispatch(zio_t *zio, zio_taskq_type_t q, boolean_t cutinline)
* If this is a high priority I/O, then use the high priority taskq if
* available.
*/
if (zio->io_priority == ZIO_PRIORITY_NOW &&
if ((zio->io_priority == ZIO_PRIORITY_NOW ||
zio->io_priority == ZIO_PRIORITY_SYNC_WRITE) &&
spa->spa_zio_taskq[t][q + 1].stqs_count != 0)
q++;