netdev - Re: tcp: add NV congestion control

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Date:	Thu, 27 Aug 2015 05:52:51 +0000
From:	Lawrence Brakmo <brakmo@...com>
To:	Lawrence Brakmo <brakmo@...com>, netdev <netdev@...r.kernel.org>
CC:	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>,
	Kenneth Klette Jonassen <kennetkl@....uio.no>
Subject: Re: tcp: add NV congestion control

The updated NV document with the new experiments and a table with all the
experimental results are now available at
(http://www.brakmo.org/networking/tcp-nv/TCPNV.html).

- Lawrence
 

On 8/25/15, 4:33 PM, "Lawrence Brakmo" <brakmo@...com> wrote:

>Changes from v5: cleaning of NV code, changing some default parameters
>
>I've run more extensive tests, I'm working on updating the NV website
>(http://www.brakmo.org/networking/tcp-nv/TCPNV.html) should be updated
>by tomorrow (8/26).
>
>The updated tests include Reno, Cubic, NV and CDG and include more types
>of traffic. Overview of results:
>1) NV has a little lower throughput (2-3% less) with small number of flows
>   as compared to Reno, Cubic and CDG
>2) NV is less fair with few flows but becomes more fair with more flows
>3) Less losses with NV (none in many cases) as compared to all others.
>   One exception is when things get very congested (64 flows into one
>   server), NV has 50% more losses than CDG, Cubic has 1.8x to 10x more
>   losses than CDG. Reno has about the same losses as CDG.
>4) In mixed traffic (1M and 10K RPCs), 10K flows achieve much higher
>   average throughput with NV than with the others (which are
>   very similar). In one example, 2 clients sending 1M and 10K to 2
>   servers, with NV 10K flows average 1Gbps and 1M flows 3.7Gbps,
>   whereas they average about 226Mbps and 4.4Gbps for Reno, Cubic and
>   CDG. They all have similar link utilization.
>
>Consists of the following patches:
>
>[RFC PATCH v6 net-next 1/4] tcp: replace cnt & rtt with struct in
>[RFC PATCH v6 net-next 2/4] tcp:  refactor struct tcp_skb_cb
>[RFC PATCH v6 net-next 3/4] tcp: add in_flight to tcp_skb_cb
>[RFC PATCH v6 net-next 4/4] tcp: add NV congestion control
>
>Signed-off-by: Lawrence Brakmo <brakmo@...com>
>
>include/net/tcp.h       |  20 ++-
>net/ipv4/Kconfig        |  16 ++
>net/ipv4/Makefile       |   1 +
>net/ipv4/tcp_bic.c      |   6 +-
>net/ipv4/tcp_cdg.c      |  14 +-
>net/ipv4/tcp_cubic.c    |   6 +-
>net/ipv4/tcp_htcp.c     |  10 +-
>net/ipv4/tcp_illinois.c |  20 +--
>net/ipv4/tcp_input.c    |  10 +-
>net/ipv4/tcp_lp.c       |   6 +-
>net/ipv4/tcp_nv.c       | 489
>++++++++++++++++++++++++++++++++++++++++++++++++++++++
>net/ipv4/tcp_output.c   |   4 +-
>net/ipv4/tcp_vegas.c    |   6 +-
>net/ipv4/tcp_vegas.h    |   2 +-
>net/ipv4/tcp_veno.c     |   7 +-
>net/ipv4/tcp_westwood.c |   7 +-
>net/ipv4/tcp_yeah.c     |   7 +-
>17 files changed, 580 insertions(+), 51 deletions(-)

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