r292: Add note about deadline scheduler

diff --git a/README b/README
index a53024a..70018ed 100644 (file)
--- a/README
+++ b/README
@@ -21,6 +21,14 @@ device nodes:
 (if you need more than one NBD device, repeat the above command for nb1,
 nb2, ...)
 
 (if you need more than one NBD device, repeat the above command for nb1,
 nb2, ...)
 

+Since there's a problem with nbd and the (default) cfq I/O scheduler,
+you may want to set it to deadline:
+
+echo 'deadline' > /sys/block/nbd0/queue/scheduler
+
+(again, repeat the above for nbd1, nbd2, etc, if you need more than one
+device)
+

 Next, start the server. You can use a file or a block device for that:
 
 nbd-server <port> <filename>
 Next, start the server. You can use a file or a block device for that:
 
 nbd-server <port> <filename>