Re: [aqm] [Bloat] TCP BBR paper is now generally available

Eric Dumazet <eric.dumazet@gmail.com> Sat, 03 December 2016 22:55 UTC

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From: Eric Dumazet <eric.dumazet@gmail.com>
To: "Steinar H. Gunderson" <sgunderson@bigfoot.com>
Date: Sat, 03 Dec 2016 14:55:37 -0800
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Cc: Jonathan Morton <chromatix99@gmail.com>, Neal Cardwell <ncardwell@google.com>, "aqm@ietf.org" <aqm@ietf.org>, bloat <bloat@lists.bufferbloat.net>
Subject: Re: [aqm] [Bloat] TCP BBR paper is now generally available
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On Sat, 2016-12-03 at 23:13 +0100, Steinar H. Gunderson wrote:
> On Sat, Dec 03, 2016 at 01:50:37PM -0800, Eric Dumazet wrote:
> >> Note, the tcpdump is done at the receiver. I don't know if this changes the
> >> analysis.
> > If you have access to the receiver, I would be interested to know
> > NIC/driver used there ?
> 
> root@blackhole:~# lspci  | grep Ethernet
> 01:00.0 Ethernet controller: Intel Corporation 82574L Gigabit Network Connection
> 02:00.0 Ethernet controller: Intel Corporation 82574L Gigabit Network Connection
> 
> root@blackhole:~# lspci -n | grep 01:00.0
> 01:00.0 0200: 8086:10d3
> 
> root@blackhole:~# ls -l /sys/class/net/eth0/device/driver
> lrwxrwxrwx 1 root root 0 des.   3 23:17 /sys/class/net/eth0/device/driver -> ../../../../bus/pci/drivers/e1000e
> 
> root@blackhole:~# uname -a
> Linux blackhole 3.16.0-4-amd64 #1 SMP Debian 3.16.36-1+deb8u2 (2016-10-19) x86_64 GNU/Linux
> 
> Do note, both eth0 and eth1 are a bridge, although only one of the cards are
> actually connected to anything (it's just so the remote hands can connect to
> any port and things will come up fine).

Perfect.

Note that starting from linux-4.4, e1000e gets gro_flush_timeout that
would help this precise workload

https://git.kernel.org/cgit/linux/kernel/git/davem/net.git/commit/?id=32b3e08fff60494cd1d281a39b51583edfd2b18f

Maybe you can redo the experiment in ~5 years when distro catches up ;)

Thanks.