netdev - Re: [PATCH net-next 1/2] tcp_bbr: better deal with suboptimal GSO (II)

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Date:   Wed, 28 Feb 2018 22:15:40 -0500
From:   Neal Cardwell <ncardwell@...gle.com>
To:     Eric Dumazet <edumazet@...gle.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Yuchung Cheng <ycheng@...gle.com>,
        Soheil Hassas Yeganeh <soheil@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [PATCH net-next 1/2] tcp_bbr: better deal with suboptimal GSO (II)

On Wed, Feb 28, 2018 at 5:40 PM, Eric Dumazet <edumazet@...gle.com> wrote:
>
> This is second part of dealing with suboptimal device gso parameters.
> In first patch (350c9f484bde "tcp_bbr: better deal with suboptimal GSO")
> we dealt with devices having low gso_max_segs
>
> Some devices lower gso_max_size from 64KB to 16 KB (r8152 is an example)
>
> In order to probe an optimal cwnd, we want BBR being not sensitive
> to whatever GSO constraint a device can have.
>
> This patch removes tso_segs_goal() CC callback in favor of
> min_tso_segs() for CC wanting to override sysctl_tcp_min_tso_segs
>
> Next patch will remove bbr->tso_segs_goal since it does not have
> to be persistent.
>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> ---

Acked-by: Neal Cardwell <ncardwell@...gle.com>

Looks great to me. Thanks, Eric!

neal