c/mirror_zfs
1
0
Fork 0
mirror of https://git.proxmox.com/git/mirror_zfs.git synced 2026-05-23 02:44:41 +03:00
Code Issues Packages Projects Releases Wiki Activity

Illumos 4753 - increase number of outstanding async writes when sync task is waiting

Browse Source 
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Adam Leventhal <ahl@delphix.com>
Reviewed by: Christopher Siden <christopher.siden@delphix.com>
Reviewed by: Dan McDonald <danmcd@omniti.com>
Approved by: Garrett D'Amore <garrett@damore.org>

References:
    https://www.illumos.org/issues/4753
    https://github.com/illumos/illumos-gate/commit/73527f4

Comments by Matt Ahrens from the issue tracker:
    When a sync task is waiting for a txg to complete, we should hurry
    it along by increasing the number of outstanding async writes
    (i.e. make vdev_queue_max_async_writes() return a larger number).
    Initially we might just have a tunable for "minimum async writes
    while a synctask is waiting" and set it to 3.

Ported-by: Tim Chase <tim@chase2k.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #2716
This commit is contained in:
Alex Reece
2014-07-18 07:08:31 -08:00
committed by Brian Behlendorf
parent 1f6f97f304
commit acbad6ff67
5 changed files with 46 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files
module/zfs/vdev_queue.c
+12 -4
View File
@@ -24,7 +24,7 @@
*/
/*
* Copyright (c) 2013 by Delphix. All rights reserved.
* Copyright (c) 2012, 2014 by Delphix. All rights reserved.
*/
#include <sys/zfs_context.h>
@@ -230,14 +230,23 @@ vdev_queue_class_min_active(zio_priority_t p)
}
static int
vdev_queue_max_async_writes(uint64_t dirty)
vdev_queue_max_async_writes(spa_t *spa)
{
int writes;
uint64_t dirty = spa->spa_dsl_pool->dp_dirty_total;
uint64_t min_bytes = zfs_dirty_data_max *
zfs_vdev_async_write_active_min_dirty_percent / 100;
uint64_t max_bytes = zfs_dirty_data_max *
zfs_vdev_async_write_active_max_dirty_percent / 100;
/*
* Sync tasks correspond to interactive user actions. To reduce the
* execution time of those actions we push data out as fast as possible.
*/
if (spa_has_pending_synctask(spa)) {
return (zfs_vdev_async_write_max_active);
}
if (dirty < min_bytes)
return (zfs_vdev_async_write_min_active);
if (dirty > max_bytes)
@@ -270,8 +279,7 @@ vdev_queue_class_max_active(spa_t *spa, zio_priority_t p)
case ZIO_PRIORITY_ASYNC_READ:
return (zfs_vdev_async_read_max_active);
case ZIO_PRIORITY_ASYNC_WRITE:
return (vdev_queue_max_async_writes(
spa->spa_dsl_pool->dp_dirty_total));
return (vdev_queue_max_async_writes(spa));
case ZIO_PRIORITY_SCRUB:
return (zfs_vdev_scrub_max_active);
default: