General list for discussing Bufferbloat
 help / color / mirror / Atom feed
From: Aaron Wood <woody77@gmail.com>
To: Colin Dearborn <Colin.Dearborn@sjrb.ca>
Cc: bloat <bloat@lists.bufferbloat.net>
Subject: Re: [Bloat] different speeds on different ports? (benchmarking fun)
Date: Thu, 21 Sep 2017 08:13:58 -0700	[thread overview]
Message-ID: <CALQXh-NALDu=-XQ6yFoC8mSnx7yZ1XoMQR7pzf6As8y0gYKMWg@mail.gmail.com> (raw)
In-Reply-To: <DM5PR04MB1034A4BA6B47DDCFB094C9DB95660@DM5PR04MB1034.namprd04.prod.outlook.com>


[-- Attachment #1.1: Type: text/plain, Size: 2205 bytes --]

I'd wondered about single vs. multiple, but I'm getting pretty consistent
speeds from the flent-fremont node irrespective of the number of streams
that I use (1, 4, 12, etc).

On Thu, Sep 21, 2017 at 7:50 AM, Colin Dearborn <Colin.Dearborn@sjrb.ca>
wrote:

> This is my guess.
>
> DSL reports uses many streams from different servers to achieve these
> speeds.
>
> I’m assuming flent is a single stream, so you’re at the mercy of TCP
> receive windows and latency limiting how fast you can go on that single
> stream.
>
>
>
> *From:* Bloat [mailto:bloat-bounces@lists.bufferbloat.net] *On Behalf Of *Aaron
> Wood
> *Sent:* Tuesday, August 29, 2017 11:16 PM
> *To:* bloat <bloat@lists.bufferbloat.net>
> *Subject:* [Bloat] different speeds on different ports? (benchmarking fun)
>
>
>
> I don't have a full writeup yet, but wanted to ask if people on here have
> run into this.
>
>
>
> I'm seeing a disparity between flent and the dslreports speed tests.  On
> my connection at home (Comcast 150/12), I figured it was something related
> to the test implementations, but minor.  But on a connect at a friend with
> business-class Comcast (300/12), we're seeing a huge difference.  Flent
> can't seem to achieve more than 120Mbps, often with an early, couple-second
> hump at a much higher speed.  But dslreports' speed tests gets the full
> 300Mbps.
>
>
>
> In looking closer at my connection, with sqm (cake) turned off, I'm seeing
> ~180Mbps download with 500ms of bufferbloat when I use the dslreports test (
> http://www.dslreports.com/speedtest/20805152).
>
>
>
> Yet flent can't come close to that, even with the tcp_12down test:
>
>
> ​
>
> The current hypothesis that we have is that this is due to either traffic
> class, or the ports that traffic are running on.  I've ruled out the ping
> streams, as a parallel set of netperf tcp_maerts downloads has the same
> 120Mbps roof.
>
>
>
> It would be interesting if we could run some netperf tests using port
> 80/443 for the listening socket for the data connection (although if doing
> deep-packet inspection, we might need to use an actual HTTP transfer).
>
>
>
> -Aaron
>

[-- Attachment #1.2: Type: text/html, Size: 4424 bytes --]

[-- Attachment #2: image002.png --]
[-- Type: image/png, Size: 38956 bytes --]

  reply	other threads:[~2017-09-21 15:14 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-08-30  5:15 Aaron Wood
2017-09-21  2:06 ` Dave Taht
2017-09-21  2:34 ` Dave Taht
2017-09-21 10:58 ` Stefan Alfredsson
2017-09-21 11:16 ` Toke Høiland-Jørgensen
2017-09-21 12:51   ` Sebastian Moeller
2017-09-22  0:26   ` David Lang
2017-09-21 14:50 ` Colin Dearborn
2017-09-21 15:13   ` Aaron Wood [this message]
2017-09-21 15:16     ` Aaron Wood
2017-09-23  2:51       ` Aaron Wood

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='CALQXh-NALDu=-XQ6yFoC8mSnx7yZ1XoMQR7pzf6As8y0gYKMWg@mail.gmail.com' \
    --to=woody77@gmail.com \
    --cc=Colin.Dearborn@sjrb.ca \
    --cc=bloat@lists.bufferbloat.net \
    /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