linux-kernel - Re: [PATCH net-next V3 0/3] Introduce and use NUMA distance metrics

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Date:   Sun, 24 Jul 2022 15:09:11 +0300
From:   Tariq Toukan <ttoukan.linux@...il.com>
To:     Tariq Toukan <tariqt@...dia.com>,
        "David S. Miller" <davem@...emloft.net>,
        Saeed Mahameed <saeedm@...dia.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>
Cc:     Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        Gal Pressman <gal@...dia.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next V3 0/3] Introduce and use NUMA distance metrics



On 7/19/2022 7:23 PM, Tariq Toukan wrote:
> Hi,
> 
> Implement and expose CPU spread API based on the scheduler's
> sched_numa_find_closest().  Use it in mlx5 and enic device drivers.  This
> replaces the binary NUMA preference (local / remote) with an improved one
> that minds the actual distances, so that remote NUMAs with short distance
> are preferred over farther ones.
> 
> This has significant performance implications when using NUMA-aware
> memory allocations, improving the throughput and CPU utilization.
> 
> Regards,
> Tariq
> 
> v3:
> - Introduce the logic as a common API instead of being mlx5 specific.
> - Add implementation to enic device driver.
> - Use non-atomic version of __cpumask_clear_cpu.
> 

Comments on V2 were addressed.
Please let me now of any other comments on this V3.