Mercurial > illumos > git > illumos-omnios
changeset 21397:cc6857011980
9751 Allocation throttling misplacing ditto blocks
Portions contributed by: Kody Kantor <kody.kantor@joyent.com>
Reviewed by: Pavel Zakharov <pavel.zakharov@delphix.com>
Reviewed by: Matt Ahrens <matt@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Approved by: Gordon Ross <gwr@nexenta.com>
| author | Alexander Motin <mav@FreeBSD.org> |
|---|---|
| date | Mon, 22 Apr 2019 19:09:42 +0000 |
| parents | a1dd191628fc |
| children | 6b5d876262d2 |
| files | usr/src/uts/common/fs/zfs/metaslab.c |
| diffstat | 1 files changed, 10 insertions(+), 3 deletions(-) [+] |
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--- a/usr/src/uts/common/fs/zfs/metaslab.c Tue Oct 17 10:04:43 2017 -0400 +++ b/usr/src/uts/common/fs/zfs/metaslab.c Mon Apr 22 19:09:42 2019 +0000 @@ -1012,7 +1012,7 @@ */ static boolean_t metaslab_group_allocatable(metaslab_group_t *mg, metaslab_group_t *rotor, - uint64_t psize, int allocator) + uint64_t psize, int allocator, int d) { spa_t *spa = mg->mg_vd->vdev_spa; metaslab_class_t *mc = mg->mg_class; @@ -1056,6 +1056,13 @@ if (mg->mg_no_free_space) return (B_FALSE); + /* + * Relax allocation throttling for ditto blocks. Due to + * random imbalances in allocation it tends to push copies + * to one vdev, that looks a bit better at the moment. + */ + qmax = qmax * (4 + d) / 4; + qdepth = zfs_refcount_count( &mg->mg_alloc_queue_depth[allocator]); @@ -1077,7 +1084,7 @@ */ for (mgp = mg->mg_next; mgp != rotor; mgp = mgp->mg_next) { qmax = mgp->mg_cur_max_alloc_queue_depth[allocator]; - + qmax = qmax * (4 + d) / 4; qdepth = zfs_refcount_count( &mgp->mg_alloc_queue_depth[allocator]); @@ -3710,7 +3717,7 @@ */ if (allocatable && !GANG_ALLOCATION(flags) && !try_hard) { allocatable = metaslab_group_allocatable(mg, rotor, - psize, allocator); + psize, allocator, d); } if (!allocatable) {