netdev - Re: [PATCH 0/4] cpumask: improve on cpumask_local

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Date:   Sun, 13 Nov 2022 09:37:59 +0200
From:   Tariq Toukan <ttoukan.linux@...il.com>
To:     Yury Norov <yury.norov@...il.com>, Jakub Kicinski <kuba@...nel.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Barry Song <baohua@...nel.org>,
        Ben Segall <bsegall@...gle.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Gal Pressman <gal@...dia.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Ingo Molnar <mingo@...hat.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Leon Romanovsky <leonro@...dia.com>,
        Mel Gorman <mgorman@...e.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Saeed Mahameed <saeedm@...dia.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Tariq Toukan <tariqt@...dia.com>,
        Tony Luck <tony.luck@...el.com>,
        Valentin Schneider <vschneid@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        linux-crypto@...r.kernel.org, Netdev <netdev@...r.kernel.org>,
        "open list:HFI1 DRIVER" <linux-rdma@...r.kernel.org>
Subject: Re: [PATCH 0/4] cpumask: improve on cpumask_local_spread() locality



On 11/11/2022 6:47 PM, Yury Norov wrote:
> 
> 
> On Fri, Nov 11, 2022, 10:25 AM Jakub Kicinski <kuba@...nel.org 
> <mailto:kuba@...nel.org>> wrote:
> 
>     On Thu, 10 Nov 2022 20:00:23 -0800 Yury Norov wrote:
>      > cpumask_local_spread() currently checks local node for presence
>     of i'th
>      > CPU, and then if it finds nothing makes a flat search among all
>     non-local
>      > CPUs. We can do it better by checking CPUs per NUMA hops.
> 
>     Nice.
> 

Thanks for your series.
This improves them all, with no changes required to the network device 
drivers.

>      > This series is inspired by Valentin Schneider's "net/mlx5e:
>     Improve remote
>      > NUMA preferences used for the IRQ affinity hints"
>      >
>      >
>     https://patchwork.kernel.org/project/netdevbpf/patch/20220728191203.4055-3-tariqt@nvidia.com/ <https://patchwork.kernel.org/project/netdevbpf/patch/20220728191203.4055-3-tariqt@nvidia.com/>


Find my very first version here, including the perf testing results:
https://patchwork.kernel.org/project/netdevbpf/list/?series=660413&state=*


>      >
>      > According to Valentin's measurements, for mlx5e:
>      >
>      >       Bottleneck in RX side is released, reached linerate (~1.8x
>     speedup).
>      >       ~30% less cpu util on TX.
>      >
>      > This patch makes cpumask_local_spread() traversing CPUs based on NUMA
>      > distance, just as well, and I expect comparabale improvement for its
>      > users, as in Valentin's case.
>      >

Right.

>      > I tested it on my VM with the following NUMA configuration:
> 
>     nit: the authorship is a bit more complicated, it'd be good to mention
>     Tariq. Both for the code and attribution of the testing / measurements.
> 
> 
> Sure. Tariq and Valentine please send your tags as appropriate.
> 

I wonder what fits best here?

As the contribution is based upon previous work that I developed, then 
probably:
Signed-off-by: Tariq Toukan <tariqt@...dia.com>

Thanks,
Tariq