General list for discussing Bufferbloat
 help / color / mirror / Atom feed
From: Eric Dumazet <eric.dumazet@gmail.com>
To: "Steinar H. Gunderson" <sgunderson@bigfoot.com>
Cc: Neal Cardwell <ncardwell@google.com>,
	Jonathan Morton <chromatix99@gmail.com>,
	"aqm@ietf.org" <aqm@ietf.org>,
	bloat <bloat@lists.bufferbloat.net>
Subject: Re: [Bloat] TCP BBR paper is now generally available
Date: Sat, 03 Dec 2016 12:20:15 -0800	[thread overview]
Message-ID: <1480796415.18162.408.camel@edumazet-glaptop3.roam.corp.google.com> (raw)
In-Reply-To: <20161203191353.GA972@sesse.net>

On Sat, 2016-12-03 at 20:13 +0100, Steinar H. Gunderson wrote:
> On Sat, Dec 03, 2016 at 08:03:50AM -0500, Neal Cardwell wrote:
> > Thanks for the report, Steinar. This is the first report we've had
> > like this, but it would be interesting to find out what's going on.
> > 
> > Even if you don't have time to apply the patches Eric mentions, it
> > would be hugely useful if the next time you have a slow transfer like
> > that you could post a link to a tcpdump packet capture (headers only
> > is best, say -s 120). Ideally the trace would capture a whole
> > connection, so we can see the wscale on the SYN exchange.
> 
> I tried reproducing it now. I can't get as far down as 50 Mbit/sec,
> but it stopped around 100 Mbit/sec, still without any clear bottlenecks.
> cubic was just as bad, though.
> 
> I've taken two tcpdumps as requested; I can't reboot this server easily
> right now, unfortunately. They are:
> 
>   http://storage.sesse.net/bbr.pcap -- ssh+tar+gnupg
>   http://storage.sesse.net/bbr2.pcap -- wget between same hosts
> 
> /* Steinar */

Hi Steinar

Huge ACK decimation it seems.

11:13:28.762772 IP6 S > C: Flags [.], seq 777672:779100, ack 3432, win 179, options [nop,nop,TS val 3498278784 ecr 864447699], length 1428
11:13:28.763145 IP6 S > C: Flags [.], seq 779100:783384, ack 3432, win 179, options [nop,nop,TS val 3498278784 ecr 864447699], length 4284
11:13:28.763190 IP6 S > C: Flags [.], seq 783384:789096, ack 3432, win 179, options [nop,nop,TS val 3498278784 ecr 864447699], length 5712
11:13:28.763239 IP6 S > C: Flags [.], seq 789096:790524, ack 3432, win 179, options [nop,nop,TS val 3498278784 ecr 864447699], length 1428
11:13:28.763334 IP6 S > C: Flags [.], seq 790524:791952, ack 3432, win 179, options [nop,nop,TS val 3498278784 ecr 864447699], length 1428
11:13:28.764109 IP6 S > C: Flags [.], seq 791952:794808, ack 3432, win 179, options [nop,nop,TS val 3498278785 ecr 864447699], length 2856
11:13:28.764138 IP6 S > C: Flags [.], seq 794808:800520, ack 3432, win 179, options [nop,nop,TS val 3498278785 ecr 864447699], length 5712
11:13:28.764189 IP6 S > C: Flags [.], seq 800520:804804, ack 3432, win 179, options [nop,nop,TS val 3498278785 ecr 864447699], length 4284
11:13:28.764980 IP6 S > C: Flags [.], seq 804804:806232, ack 3432, win 179, options [nop,nop,TS val 3498278787 ecr 864447700], length 1428
11:13:28.765034 IP6 S > C: Flags [.], seq 806232:811944, ack 3432, win 179, options [nop,nop,TS val 3498278787 ecr 864447700], length 5712
11:13:28.765086 IP6 S > C: Flags [.], seq 811944:817656, ack 3432, win 179, options [nop,nop,TS val 3498278787 ecr 864447700], length 5712
11:13:28.765905 IP6 S > C: Flags [.], seq 817656:823368, ack 3432, win 179, options [nop,nop,TS val 3498278787 ecr 864447700], length 5712
11:13:28.765956 IP6 S > C: Flags [.], seq 823368:829080, ack 3432, win 179, options [nop,nop,TS val 3498278787 ecr 864447700], length 5712
11:13:28.766005 IP6 S > C: Flags [.], seq 829080:831936, ack 3432, win 179, options [nop,nop,TS val 3498278787 ecr 864447700], length 2856
11:13:28.766869 IP6 S > C: Flags [.], seq 831936:834792, ack 3460, win 179, options [nop,nop,TS val 3498278789 ecr 864447700], length 2856
11:13:28.766898 IP6 S > C: Flags [.], seq 834792:840504, ack 3460, win 179, options [nop,nop,TS val 3498278789 ecr 864447700], length 5712
11:13:28.766947 IP6 S > C: Flags [.], seq 840504:841932, ack 3460, win 179, options [nop,nop,TS val 3498278789 ecr 864447700], length 1428
11:13:28.766997 IP6 S > C: Flags [.], seq 841932:843360, ack 3460, win 179, options [nop,nop,TS val 3498278789 ecr 864447700], length 1428
11:13:28.767532 IP6 C > S: Flags [.], ack 783384, win 4106, options [nop,nop,TS val 864447710 ecr 3498278784], length 0
11:13:28.767541 IP6 C > S: Flags [.], ack 789096, win 4151, options [nop,nop,TS val 864447710 ecr 3498278784], length 0
11:13:28.767543 IP6 C > S: Flags [.], ack 791952, win 4173, options [nop,nop,TS val 864447710 ecr 3498278784], length 0
11:13:28.767544 IP6 C > S: Flags [.], ack 794808, win 4195, options [nop,nop,TS val 864447710 ecr 3498278785], length 0
11:13:28.767546 IP6 C > S: Flags [.], ack 800520, win 4240, options [nop,nop,TS val 864447710 ecr 3498278785], length 0
11:13:28.767547 IP6 C > S: Flags [.], ack 804804, win 4273, options [nop,nop,TS val 864447710 ecr 3498278785], length 0
11:13:28.767549 IP6 C > S: Flags [.], ack 811944, win 4329, options [nop,nop,TS val 864447710 ecr 3498278787], length 0
11:13:28.767550 IP6 C > S: Flags [.], ack 817656, win 4374, options [nop,nop,TS val 864447710 ecr 3498278787], length 0
11:13:28.767552 IP6 C > S: Flags [.], ack 823368, win 4418, options [nop,nop,TS val 864447711 ecr 3498278787], length 0
11:13:28.767553 IP6 C > S: Flags [.], ack 829080, win 4463, options [nop,nop,TS val 864447711 ecr 3498278787], length 0
11:13:28.767554 IP6 C > S: Flags [.], ack 831936, win 4485, options [nop,nop,TS val 864447711 ecr 3498278787], length 0
11:13:28.767556 IP6 C > S: Flags [.], ack 834792, win 4508, options [nop,nop,TS val 864447711 ecr 3498278789], length 0
11:13:28.767557 IP6 C > S: Flags [.], ack 840504, win 4552, options [nop,nop,TS val 864447711 ecr 3498278789], length 0
11:13:28.767559 IP6 C > S: Flags [.], ack 843360, win 4575, options [nop,nop,TS val 864447711 ecr 3498278789], length 0

Just to be clear,what is the kernel version at the sender ?

Thanks !



  reply	other threads:[~2016-12-03 20:20 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-12-02 15:52 Dave Taht
2016-12-02 19:15 ` Aaron Wood
2016-12-02 20:32   ` Jonathan Morton
2016-12-02 22:22     ` Neal Cardwell
2016-12-02 22:40       ` Steinar H. Gunderson
2016-12-02 23:31         ` Eric Dumazet
2016-12-03 13:03           ` Neal Cardwell
2016-12-03 19:13             ` Steinar H. Gunderson
2016-12-03 20:20               ` Eric Dumazet [this message]
2016-12-03 20:26                 ` Jonathan Morton
2016-12-03 21:07                   ` Eric Dumazet
2016-12-03 21:34                     ` Steinar H. Gunderson
2016-12-03 21:50                       ` Eric Dumazet
2016-12-03 22:13                         ` Steinar H. Gunderson
2016-12-03 22:55                           ` Eric Dumazet
2016-12-03 23:02                             ` Eric Dumazet
2016-12-03 23:09                               ` Eric Dumazet
2016-12-03 23:03                             ` Steinar H. Gunderson
2016-12-03 23:15                               ` Eric Dumazet
2016-12-03 23:24                                 ` Eric Dumazet
2016-12-04  3:18                                   ` Neal Cardwell
2016-12-04  8:44                                   ` Steinar H. Gunderson
2016-12-04 17:13                                     ` Eric Dumazet
2016-12-04 17:38                                       ` Steinar H. Gunderson
2016-12-06 17:20                                   ` Steinar H. Gunderson
2016-12-06 21:31                                     ` Neal Cardwell
2016-12-03 21:38                     ` Jonathan Morton
2016-12-03 21:33                 ` Steinar H. Gunderson
2016-12-07 16:28               ` Alan Jenkins
2016-12-07 16:47                 ` Steinar H. Gunderson
2016-12-07 17:03                   ` Alan Jenkins
2016-12-08  8:24 ` Mikael Abrahamsson
2016-12-08 13:22   ` Dave Täht
2016-12-08 14:01     ` Mikael Abrahamsson
2016-12-08 21:29       ` Neal Cardwell
2016-12-08 22:31         ` Yuchung Cheng
2016-12-09 14:52           ` Klatsky, Carl

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

  List information: https://lists.bufferbloat.net/postorius/lists/bloat.lists.bufferbloat.net/

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1480796415.18162.408.camel@edumazet-glaptop3.roam.corp.google.com \
    --to=eric.dumazet@gmail.com \
    --cc=aqm@ietf.org \
    --cc=bloat@lists.bufferbloat.net \
    --cc=chromatix99@gmail.com \
    --cc=ncardwell@google.com \
    --cc=sgunderson@bigfoot.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox