diff options
Diffstat (limited to 'module/zfs/metaslab.c')
| -rw-r--r-- | module/zfs/metaslab.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/module/zfs/metaslab.c b/module/zfs/metaslab.c index 12fe5890a..f4c01497f 100644 --- a/module/zfs/metaslab.c +++ b/module/zfs/metaslab.c @@ -992,7 +992,7 @@ metaslab_group_fragmentation(metaslab_group_t *mg) */ 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; @@ -1033,6 +1033,13 @@ metaslab_group_allocatable(metaslab_group_t *mg, metaslab_group_t *rotor, 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 = refcount_count(&mg->mg_alloc_queue_depth[allocator]); /* @@ -1053,7 +1060,7 @@ metaslab_group_allocatable(metaslab_group_t *mg, metaslab_group_t *rotor, */ 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 = refcount_count( &mgp->mg_alloc_queue_depth[allocator]); @@ -3379,7 +3386,7 @@ top: */ if (allocatable && !GANG_ALLOCATION(flags) && !try_hard) { allocatable = metaslab_group_allocatable(mg, rotor, - psize, allocator); + psize, allocator, d); } if (!allocatable) { |