netdev - Re: resend: tcp: performance issue with fastopen connections (mss

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Message-ID: <CADVnQyms4+gXopm=Hyqq5iAMEuv3Nn-7fdri_d86j+jWs1bjKg@mail.gmail.com>
Date:   Wed, 18 Jan 2017 13:42:15 -0500
From:   Neal Cardwell <ncardwell@...gle.com>
To:     Yuchung Cheng <ycheng@...gle.com>
Cc:     Eric Dumazet <edumazet@...gle.com>,
        Alexey Kodanev <alexey.kodanev@...cle.com>,
        Eric Dumazet <eric.dumazet@...il.com>,
        David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Vasily Isaenko <vasily.isaenko@...cle.com>
Subject: Re: resend: tcp: performance issue with fastopen connections (mss > window)

On Wed, Jan 18, 2017 at 1:27 PM, Yuchung Cheng <ycheng@...gle.com> wrote:
> Hi Eric: yeah I think the test was just due to the TSO chunking
> difference between prod and upstream, which I was able to avoid with
> this patch re-suited by Neal in b/34128974. In fact, this patch
> enables me to run all recovery tests on upstream kernels for my RACK
> patch set.
>
> Neal: can we polish and check that in? super useful.

Yes, sounds good. Glad that was useful. I will work on polishing up
and checking in the patch to make packetdrill agnostic to TSO
segmentation by default (for upstream and Google).

neal