netdev - Re: [RFC net-next] tcp: allow larger TSO to be built under overload

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Date:   Wed, 9 Mar 2022 11:42:24 -0500
From:   Neal Cardwell <ncardwell@...gle.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Eric Dumazet <edumazet@...gle.com>,
        David Laight <David.Laight@...lab.com>,
        netdev <netdev@...r.kernel.org>,
        Willem de Bruijn <willemb@...gle.com>,
        Yuchung Cheng <ycheng@...gle.com>
Subject: Re: [RFC net-next] tcp: allow larger TSO to be built under overload

On Tue, Mar 8, 2022 at 7:18 PM Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Tue, 8 Mar 2022 11:53:38 -0800 Eric Dumazet wrote:
> > Jakub, Neal, I am going to send a patch for net-next.
> >
> > In conjunction with BIG TCP, this gives a considerable boost of performance.
>
> SGTM! The change may cause increased burstiness, or is that unlikely?
> I'm asking to gauge risk / figure out appropriate roll out plan.

In theory it could cause increased burstiness in some scenarios, but
in practice we have used this min_rtt-based TSO autosizing component
in production for about two years, where we see improvements in load
tests and no problems seen in production.

neal