Development issues regarding the cerowrt test router project
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From: "Toke Høiland-Jørgensen" <toke@toke.dk>
To: Jim Gettys <jg@freedesktop.org>
Cc: bloat <bloat@lists.bufferbloat.net>,
	"Fred Baker \(fred\)" <fred@cisco.com>,
	"aqm@ietf.org" <aqm@ietf.org>,
	"cerowrt-devel@lists.bufferbloat.net"
	<cerowrt-devel@lists.bufferbloat.net>
Subject: Re: [Cerowrt-devel] [aqm] [Bloat] the side effects of 330ms lag in the real world
Date: Tue, 29 Apr 2014 19:01:36 +0200	[thread overview]
Message-ID: <87bnvkkr2n.fsf@toke.dk> (raw)
In-Reply-To: <CAGhGL2Bzo1Jmq0Tu2t-3w+2m4Sy7BpOkBQE-_C3vAg75JZR=2w@mail.gmail.com> (Jim Gettys's message of "Tue, 29 Apr 2014 12:44:38 -0400")

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Jim Gettys <jg@freedesktop.org> writes:

> Now, if someone gives me real fiber to the home, with a real switch fabric
> upstream, rather than gpon life might be somewhat better (if the switches aren't
> themselves overbuffered.... But so far, it isn't.

As a data point for this, I have fibre to my apartment building and
ethernet into the apartment. I get .5 ms to my upstream gateway and
about 6 ms to Google. Still measured up to ~20 ms of bufferbloat while
running at 100 Mbps...

http://files.toke.dk/bufferbloat/data/karlstad/cdf_comparison.png

However, as that graph shows, it is quite possible to completely avoid
bufferbloat by deploying the right shaping. And in that case fibre
*does* have a significant latency advantage. The best latency I've seen
to the upstream gateway on DSL has been ~12 ms.

-Toke

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  parent reply	other threads:[~2014-04-29 17:01 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-04-29  1:24 [Cerowrt-devel] " Dave Taht
2014-04-29  7:08 ` [Cerowrt-devel] [aqm] " Mikael Abrahamsson
2014-04-29  7:21   ` Fred Baker (fred)
2014-04-29  7:56     ` Mikael Abrahamsson
2014-04-29 15:46       ` Dave Taht
2014-04-29 16:51         ` [Cerowrt-devel] [Bloat] " Aaron Wood
2014-04-29 16:44       ` Jim Gettys
2014-04-29 16:57         ` Jim Gettys
2014-04-29 17:01         ` Toke Høiland-Jørgensen [this message]
2014-04-29 17:07           ` [Cerowrt-devel] [aqm] [Bloat] " Jim Gettys
2014-04-29 18:09             ` Greg White
2014-04-30  3:21           ` Dave Taht
2014-04-29 17:02         ` Dave Taht
2014-04-30  6:16         ` [Cerowrt-devel] [Bloat] [aqm] " Mikael Abrahamsson
2014-04-29  7:43   ` Tristan Seligmann

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