block: enable rq CPU completion affinity by default

Test results here look good, and on big OLTP runs it has also shown
to significantly increase cycles attributed to the database and
cause a performance boost.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 98b45633a27e97e84dc4b4dd0b30c2a808d1c935..8bf1a10e4d881c31938ae261d502fb3cfdd027cb 100644 (file)
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -463,7 +463,8 @@ struct request_queue
 
 #define QUEUE_FLAG_DEFAULT     ((1 << QUEUE_FLAG_IO_STAT) |            \
                                 (1 << QUEUE_FLAG_CLUSTER) |            \
-                                (1 << QUEUE_FLAG_STACKABLE))
+                                (1 << QUEUE_FLAG_STACKABLE)    |       \
+                                (1 << QUEUE_FLAG_SAME_COMP))
 
 static inline int queue_is_locked(struct request_queue *q)
 {