Re: [Xen-devel] [PATCH 9/9] xen: sched: per-core runqueues as default in credit2

[Juergen Gross <jgross@xxxxxxxx>]

On 09/29/2015 06:56 PM, Dario Faggioli wrote:
> 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@xxxxxxxxxx>
> Signed-off-by: Uma Sharma <uma.sharma523@xxxxxxxxx>
Reviewed-by: Juergen Gross <jgross@xxxxxxxx>

> ---
> Cc: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
> Cc: Uma Sharma <uma.sharma523@xxxxxxxxx>
> ---
>   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 71315b8..8fc9cd7 100644
> --- a/docs/misc/xen-command-line.markdown
> +++ b/docs/misc/xen-command-line.markdown
> @@ -470,7 +470,7 @@ combination with the `low_crashinfo` command line option.
>   ### credit2\_runqueue
>   > `= socket | core`
>
> -> 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 025626f..0e9e722 100644
> --- a/xen/common/sched_credit2.c
> +++ b/xen/common/sched_credit2.c
> @@ -211,7 +211,7 @@ integer_param("credit2_balance_over", 
> opt_overload_balance_tolerance);
>    */
>   #define OPT_RUNQUEUE_CORE   1
>   #define OPT_RUNQUEUE_SOCKET 2
> -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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