netdev - Re: [RFC PATCH v5 net-next 4/4] tcp: add NV congestion control

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Message-ID: <D20249D6.71D2%brakmo@fb.com>
Date:	Wed, 26 Aug 2015 00:05:43 +0000
From:	Lawrence Brakmo <brakmo@...com>
To:	Kenneth Klette Jonassen <kennetkl@....uio.no>
CC:	netdev <netdev@...r.kernel.org>, Kernel Team <Kernel-team@...com>,
	"Neal Cardwell" <ncardwell@...gle.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Yuchung Cheng <ycheng@...gle.com>,
	Stephen Hemminger <stephen@...workplumber.org>
Subject: Re: [RFC PATCH v5 net-next 4/4] tcp: add NV congestion control



On 8/5/15, 5:51 PM, "knneth@...il.com on behalf of Kenneth Klette
Jonassen" <knneth@...il.com on behalf of kennetkl@....uio.no> wrote:

>On Wed, Aug 5, 2015 at 3:39 AM, Lawrence Brakmo <brakmo@...com> wrote:
>> This is a request for comments.
>
>Nice to see more development on delay-based congestion control.
>
>It would be good to see how NV stacks up against CDG. Any chance of
>adding cdg as a congestion control parameter to your experiments?

Done. I¹m updating the TCP-NV page with the updated results, should be
done by tomorrow (8/26).

>Experiments on NV without its temporary cwnd reductions would also be
>of interest -- to get a reference of how effective this mechanism is.

Done. It turns out that it only improves fairness a little but hurts
P99 latencies more significantly. So it is now off by default.
Thanks for making me re-examine this feature.
 

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