diff options
Diffstat (limited to 'module/zfs/vdev_queue.c')
| -rw-r--r-- | module/zfs/vdev_queue.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/module/zfs/vdev_queue.c b/module/zfs/vdev_queue.c index 75a123ece..30a883f85 100644 --- a/module/zfs/vdev_queue.c +++ b/module/zfs/vdev_queue.c @@ -24,7 +24,7 @@ */ /* - * Copyright (c) 2012, 2017 by Delphix. All rights reserved. + * Copyright (c) 2012, 2018 by Delphix. All rights reserved. */ #include <sys/zfs_context.h> @@ -191,6 +191,15 @@ int zfs_vdev_queue_depth_pct = 1000; int zfs_vdev_queue_depth_pct = 300; #endif +/* + * When performing allocations for a given metaslab, we want to make sure that + * there are enough IOs to aggregate together to improve throughput. We want to + * ensure that there are at least 128k worth of IOs that can be aggregated, and + * we assume that the average allocation size is 4k, so we need the queue depth + * to be 32 per allocator to get good aggregation of sequential writes. + */ +int zfs_vdev_def_queue_depth = 32; + int vdev_queue_offset_compare(const void *x1, const void *x2) |