From: Jason Dillaman <dillaman@redhat.com>
Date: Wed, 27 Mar 2019 23:17:46 +0000 (-0400)
Subject: librbd: enable the simple IO scheduler by default
X-Git-Tag: v15.1.0~2945^2~2
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=136848d27f8fdbbaae9444061a412d60a2a6caaf;p=ceph.git

librbd: enable the simple IO scheduler by default

Signed-off-by: Jason Dillaman <dillaman@redhat.com>
---

diff --git a/PendingReleaseNotes b/PendingReleaseNotes
index 255ac9f0ba14..eb4e9f54eec6 100644
--- a/PendingReleaseNotes
+++ b/PendingReleaseNotes
@@ -20,3 +20,9 @@
   write IOs are completed prior to completing. The
   librbd cache policy can be controlled via a new
   "rbd_cache_policy" configuration option.
+
+* librbd now includes a simple IO scheduler which attempts to
+  batch together multiple IOs against the same backing RBD
+  data block object. The librbd IO scheduler policy can be
+  controlled via a new "rbd_io_scheduler" configuration
+  option.
diff --git a/src/common/options.cc b/src/common/options.cc
index da82ba3e28c0..b3137157fbae 100644
--- a/src/common/options.cc
+++ b/src/common/options.cc
@@ -7295,7 +7295,7 @@ static std::vector<Option> get_rbd_options() {
     .set_description("RBD Image access timestamp refresh interval. Set to 0 to disable access timestamp update."),
 
     Option("rbd_io_scheduler", Option::TYPE_STR, Option::LEVEL_ADVANCED)
-    .set_default("none")
+    .set_default("simple")
     .set_enum_allowed({"none", "simple"})
     .set_description("RBD IO scheduler"),