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authorChris Mason <chris.mason@oracle.com>2009-08-07 09:59:15 -0400
committerChris Mason <chris.mason@oracle.com>2009-09-11 13:31:05 -0400
commit57fd5a5ff8b48b99e90b22fc143082aba755c6c0 (patch)
tree8744002a9232d25a9ded597fa89c3f1b00ec410c
parenta97adc9fffb1707da4e97f91c801660c6be92aac (diff)
downloadlinux-stericsson-57fd5a5ff8b48b99e90b22fc143082aba755c6c0.tar.gz
Btrfs: tweak congestion backoff
The btrfs io submission thread tries to back off congested devices in favor of rotating off to another disk. But, it tries to make sure it submits at least some IO before rotating on (the others may be congested too), and so it has a magic number of requests it tries to write before it hops. This makes the magic number smaller. Testing shows that we're spending too much time on congested devices and leaving the other devices idle. Signed-off-by: Chris Mason <chris.mason@oracle.com>
-rw-r--r--fs/btrfs/volumes.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 5dbefd11b4af..a7e53773e743 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -276,7 +276,7 @@ loop_lock:
* is now congested. Back off and let other work structs
* run instead
*/
- if (pending && bdi_write_congested(bdi) && batch_run > 32 &&
+ if (pending && bdi_write_congested(bdi) && batch_run > 8 &&
fs_info->fs_devices->open_devices > 1) {
struct io_context *ioc;