netdev - Re: [PATCH net-next 3/9] net/mlx4_core: Set EQ affinity hint to local NUMA CPUs

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Message-ID: <VI1PR0501MB2429F11A34431293F2D0C327C47D0@VI1PR0501MB2429.eurprd05.prod.outlook.com>
Date:   Mon, 16 Jan 2017 21:54:36 +0000
From:   Daniel Jurgens <danielj@...lanox.com>
To:     Or Gerlitz <gerlitz.or@...il.com>,
        Tariq Toukan <tariqt@...lanox.com>
CC:     "David S. Miller" <davem@...emloft.net>,
        Linux Netdev List <netdev@...r.kernel.org>,
        Eran Ben Elisha <eranbe@...lanox.com>
Subject: Re: [PATCH net-next 3/9] net/mlx4_core: Set EQ affinity hint to local
 NUMA CPUs

On 1/16/2017 3:44 PM, Or Gerlitz wrote:
> On Mon, Jan 16, 2017 at 7:29 PM, Tariq Toukan <tariqt@...lanox.com> wrote:
>> From: Daniel Jurgens <danielj@...lanox.com>
>>
>> Use CPUs on the close NUMA when setting the EQ affinity hints.
> Dan, are we sure there are no down-sides for always doing this? this
> code is probably there for many years and we're introducing here new
> behaviour to potentially to many Ms installs when they get distro
> update that includes this patch.
>
I don't see a downside, this just favors using the node local CPUs before others.  I don't understand your 2nd sentence there.  "Ms installs"?