Re: [PATCH 14/16] xen: sched: per-core runqueues as default in credit2

[George Dunlap <george.dunlap@citrix.com>]

On 18/03/16 19:05, 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@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>

> ---
> Cc: George Dunlap <george.dunlap@eu.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 c242dc4..07b8c67 100644
> --- a/xen/common/sched_credit2.c
> +++ b/xen/common/sched_credit2.c
> @@ -220,7 +220,7 @@ integer_param("credit2_balance_over", opt_overload_balance_tolerance);
>  #define OPT_RUNQUEUE_SOCKET 2
>  #define OPT_RUNQUEUE_NODE   3
>  #define OPT_RUNQUEUE_ALL    4
> -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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