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

Eric Dumazet <eric.dumazet@gmail.com> Sat, 03 December 2016 23:24 UTC

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From: Eric Dumazet <eric.dumazet@gmail.com>
To: "Steinar H. Gunderson" <sgunderson@bigfoot.com>
Date: Sat, 03 Dec 2016 15:24:28 -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 15:15 -0800, Eric Dumazet wrote:
> On Sun, 2016-12-04 at 00:03 +0100, Steinar H. Gunderson wrote:
> > On Sat, Dec 03, 2016 at 02:55:37PM -0800, Eric Dumazet wrote:
> > > 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 ;)
> > 
> > I can always find a backport, assuming the IPMI is still working. But it
> > really wasn't like this earlier :-) Perhaps something changed on the path,
> > unrelated to BBR.
> 
> If the tcpdump is taken on receiver, how would you explain these gaps ?
> Like the NIC was frozen for 40 ms  !

Wait a minute. If you use fq on the receiver, then maybe your old debian
kernel did not backport :

https://git.kernel.org/cgit/linux/kernel/git/davem/net.git/commit/?id=9878196578286c5ed494778ada01da094377a686

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