netdev - Re: Linux ECN Handling

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Date:   Tue, 21 Nov 2017 11:20:16 -0500
From:   Neal Cardwell <ncardwell@...gle.com>
To:     Yuchung Cheng <ycheng@...gle.com>
Cc:     Steve Ibanez <sibanez@...nford.edu>,
        Daniel Borkmann <daniel@...earbox.net>,
        Netdev <netdev@...r.kernel.org>, Florian Westphal <fw@...len.de>,
        Mohammad Alizadeh <alizadeh@...il.mit.edu>,
        Lawrence Brakmo <brakmo@...com>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: Linux ECN Handling

On Tue, Nov 21, 2017 at 10:51 AM, Yuchung Cheng <ycheng@...gle.com> wrote:
> On Tue, Nov 21, 2017 at 7:01 AM, Neal Cardwell <ncardwell@...gle.com> wrote:
>>
>> The original motivation for only allowing TLP in the CA_Open state was
>> to be conservative and avoid having the TLP impose extra load on the
>> bottleneck when it may be congested. Plus if there are any SACKed
>> packets in the SACK scoreboard then there are other existing
>> mechanisms to do speedy loss recovery.
> Neal I like your idea of covering more states in TLP. but shouldn't we
> also fix the tso_deferral_logic to work better w/ PRR in CWR state, b/c
> it's a general transmission issue.

Yes, I agree it's also worthwhile to see if we can make PRR and TSO
deferral play well together. Sorry, I should have been more clear
about that.

neal