Btrfs: Fix streaming read performance with checksumming on

[deliverable/linux.git] / fs / btrfs / disk-io.c

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index e826730d750fe156d64c0ff4ca2efe44e1118e5d..d2d1cc87e8ad65da8c159946d6241117e0548f5e 100644 (file)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1357,10 +1357,25 @@ struct btrfs_root *open_ctree(struct super_block *sb,
         */
        btrfs_init_workers(&fs_info->workers, fs_info->thread_pool_size);
        btrfs_init_workers(&fs_info->submit_workers, fs_info->thread_pool_size);
+
+       /* a higher idle thresh on the submit workers makes it much more
+        * likely that bios will be send down in a sane order to the
+        * devices
+        */
+       fs_info->submit_workers.idle_thresh = 64;
+
        btrfs_init_workers(&fs_info->fixup_workers, 1);
        btrfs_init_workers(&fs_info->endio_workers, fs_info->thread_pool_size);
        btrfs_init_workers(&fs_info->endio_write_workers,
                           fs_info->thread_pool_size);
+
+       /*
+        * endios are largely parallel and should have a very
+        * low idle thresh
+        */
+       fs_info->endio_workers.idle_thresh = 4;
+       fs_info->endio_write_workers.idle_thresh = 4;
+
        btrfs_start_workers(&fs_info->workers, 1);
        btrfs_start_workers(&fs_info->submit_workers, 1);
        btrfs_start_workers(&fs_info->fixup_workers, 1);