netdev - Re: TCP fast retransmit issues

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Message-ID: <CADVnQynVfm0V=16sr+rHsJhtHx9b+kM7Vn2edW2GJ7qMaAtDJg@mail.gmail.com>
Date:   Wed, 26 Jul 2017 15:02:34 -0400
From:   Neal Cardwell <ncardwell@...gle.com>
To:     Willy Tarreau <w@....eu>
Cc:     Eric Dumazet <eric.dumazet@...il.com>, Klavs Klavsen <kl@...n.dk>,
        Netdev <netdev@...r.kernel.org>,
        Yuchung Cheng <ycheng@...gle.com>,
        Nandita Dukkipati <nanditad@...gle.com>
Subject: Re: TCP fast retransmit issues

On Wed, Jul 26, 2017 at 2:38 PM, Neal Cardwell <ncardwell@...gle.com> wrote:
> Yeah, it looks like I can reproduce this issue with (1) bad sacks
> causing repeated TLPs, and (2) TLPs timers being pushed out to later
> times due to incoming data. Scripts are attached.

I'm testing a fix of only scheduling a TLP if (flag & FLAG_DATA_ACKED)
is true...

neal