[PATCH v3 09/11] xen: sched: per-core runqueues as default in credit2

[Dario Faggioli <dario.faggioli@citrix.com>]

Experiments have shown that arranging the scheduing
runqueues on a per-core basis yields better results,
in most cases.

Such evaluation has been done, for the first time,
by Uma Sharma, during her participation to OPW. Some
of the results she got are summarized here:

 http://lists.xen.org/archives/html/xen-devel/2015-03/msg01499.html

Signed-off-by: Dario Faggioli <dario.faggioli@citrix.com>
Signed-off-by: Uma Sharma <uma.sharma523@gmail.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Acked-by: George Dunlap <george.dunlap@citrix.com>
---
 docs/misc/xen-command-line.markdown |    2 +-
 xen/common/sched_credit2.c          |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/docs/misc/xen-command-line.markdown b/docs/misc/xen-command-line.markdown
index 0047f94..5d801b8 100644
--- a/docs/misc/xen-command-line.markdown
+++ b/docs/misc/xen-command-line.markdown
@@ -472,7 +472,7 @@ combination with the `low_crashinfo` command line option.
 ### credit2\_runqueue
 > `= core | socket | node | all`
 
-> Default: `socket`
+> Default: `core`
 
 Specify how host CPUs are arranged in runqueues. Runqueues are kept
 balanced with respect to the load generated by the vCPUs running on
diff --git a/xen/common/sched_credit2.c b/xen/common/sched_credit2.c
index eeb3f54..d44cc3d 100644
--- a/xen/common/sched_credit2.c
+++ b/xen/common/sched_credit2.c
@@ -226,7 +226,7 @@ static const char *const opt_runqueue_str[] = {
     [OPT_RUNQUEUE_NODE] = "node",
     [OPT_RUNQUEUE_ALL] = "all"
 };
-static int __read_mostly opt_runqueue = OPT_RUNQUEUE_SOCKET;
+static int __read_mostly opt_runqueue = OPT_RUNQUEUE_CORE;
 
 static void parse_credit2_runqueue(const char *s)
 {


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