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From: George Dunlap <george.dunlap@citrix.com>
To: Dario Faggioli <dario.faggioli@citrix.com>,
	xen-devel@lists.xenproject.org
Cc: Juergen Gross <jgross@suse.com>,
	George Dunlap <george.dunlap@eu.citrix.com>,
	Uma Sharma <uma.sharma523@gmail.com>
Subject: Re: [PATCH 14/16] xen: sched: per-core runqueues as default in credit2
Date: Thu, 24 Mar 2016 12:37:29 +0000	[thread overview]
Message-ID: <56F3DF89.5070409@citrix.com> (raw)
In-Reply-To: <20160318190550.8117.76878.stgit@Solace.station>

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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  reply	other threads:[~2016-03-24 12:37 UTC|newest]

Thread overview: 61+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-18 19:03 [PATCH 00/16] Fixes and improvement (including hard affinity!) for Credit2 Dario Faggioli
2016-03-18 19:04 ` [PATCH 01/16] xen: sched: fix locking when allocating an RTDS pCPU Dario Faggioli
2016-03-19  2:22   ` Meng Xu
2016-03-23 15:37   ` George Dunlap
2016-03-18 19:04 ` [PATCH 02/16] xen: sched: add .init_pdata hook to the scheduler interface Dario Faggioli
2016-03-22  8:08   ` Juergen Gross
2016-03-23 17:32   ` George Dunlap
2016-03-18 19:04 ` [PATCH 03/16] xen: sched: make implementing .alloc_pdata optional Dario Faggioli
2016-03-19  2:23   ` Meng Xu
2016-03-21 14:22   ` Jan Beulich
2016-03-23 17:36     ` George Dunlap
2016-03-24  9:43       ` Jan Beulich
2016-03-24 13:14         ` Dario Faggioli
2016-03-21 14:48   ` Juergen Gross
2016-03-21 15:07     ` Jan Beulich
2016-04-01 17:01       ` Dario Faggioli
2016-04-04  4:21         ` Juergen Gross
2016-04-04  6:13         ` Jan Beulich
2016-04-05 16:01           ` Dario Faggioli
2016-03-23 17:38   ` George Dunlap
2016-03-18 19:04 ` [PATCH 04/16] xen: sched: implement .init_pdata in all schedulers Dario Faggioli
2016-03-19  2:24   ` Meng Xu
2016-03-22  8:03   ` Juergen Gross
2016-03-23 17:46     ` George Dunlap
2016-03-18 19:04 ` [PATCH 05/16] xen: sched: move pCPU initialization in an helper Dario Faggioli
2016-03-23 17:51   ` George Dunlap
2016-03-23 18:09     ` George Dunlap
2016-03-24 13:21     ` Dario Faggioli
2016-03-18 19:04 ` [PATCH 06/16] xen: sched: prepare a .switch_sched hook for Credit1 Dario Faggioli
2016-03-18 19:04 ` [PATCH 07/16] xen: sched: prepare a .switch_sched hook for Credit2 Dario Faggioli
2016-03-18 19:04 ` [PATCH 08/16] " Dario Faggioli
2016-03-19  2:24   ` Meng Xu
2016-03-21 14:25   ` Jan Beulich
2016-03-18 19:05 ` [PATCH 09/16] xen: sched: close potential races when switching scheduler to CPUs Dario Faggioli
2016-03-19  2:25   ` Meng Xu
2016-03-23 19:05   ` George Dunlap
2016-04-05 16:26     ` Dario Faggioli
2016-04-06 15:51       ` Dario Faggioli
2016-03-24 12:14   ` George Dunlap
2016-04-05 17:37     ` Dario Faggioli
2016-04-06 16:21       ` Dario Faggioli
2016-03-18 19:05 ` [PATCH 10/16] xen: sched: improve credit2 bootparams' scope, placement and signedness Dario Faggioli
2016-03-21 14:51   ` Juergen Gross
2016-03-24 12:20   ` George Dunlap
2016-03-18 19:05 ` [PATCH 11/16] xen: sched: on Credit2, don't reprogram the timer if idle Dario Faggioli
2016-03-24 15:03   ` George Dunlap
2016-03-18 19:05 ` [PATCH 12/16] xen: sched: fix per-socket runqueue creation in credit2 Dario Faggioli
2016-03-24 12:24   ` George Dunlap
2016-03-18 19:05 ` [PATCH 13/16] xen: sched: allow for choosing credit2 runqueues configuration at boot Dario Faggioli
2016-03-22  7:46   ` Juergen Gross
2016-03-24 12:36   ` George Dunlap
2016-03-18 19:05 ` [PATCH 14/16] xen: sched: per-core runqueues as default in credit2 Dario Faggioli
2016-03-24 12:37   ` George Dunlap [this message]
2016-03-18 19:06 ` [PATCH 15/16] xen: sched: scratch space for cpumasks on Credit2 Dario Faggioli
2016-03-18 19:27   ` Andrew Cooper
2016-03-24 12:44     ` George Dunlap
2016-03-24 12:56       ` Andrew Cooper
2016-03-24 13:10       ` Dario Faggioli
2016-03-18 19:06 ` [PATCH 16/16] xen: sched: implement vcpu hard affinity in Credit2 Dario Faggioli
2016-03-24 15:42   ` George Dunlap
2016-04-05 16:50     ` Dario Faggioli

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