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From: Jamie Lokier <jamie@shareable.org>
To: Andrea Arcangeli <andrea@suse.de>
Cc: Larry McVoy <lm@work.bitmover.com>, Larry McVoy <lm@bitmover.com>,
	Alan Cox <alan@lxorguk.ukuu.org.uk>,
	Pascal Schmidt <der.eremit@email.de>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: bandwidth for bkbits.net (good news)
Date: Mon, 1 Sep 2003 01:50:41 +0100	[thread overview]
Message-ID: <20030901005041.GC31531@mail.jlokier.co.uk> (raw)
In-Reply-To: <20030901002815.GB11503@dualathlon.random>

Andrea Arcangeli wrote:
> Depending on the connect/sec of the http server (not bkbits, for the
> largest part of the conversation I couldn't know about the http server,
> Larry only mentioned the bkbits.net clone until recently), the
> "reservation" margin will have to change: the less connect/sec the
> smaller margin Larry will need to reserve, the more connect/sec the
> bigger marging will be necessary.

Hi Andrea,

Above a certain connection rate, no amount of margin is enough.  The
connections are a SYN flood.

You need to take into account the peak rate, which varies from second
to second, due to simple statistics plus the tendency of the net to
make traffic burstier than it started.

Above a certain number of packets/sec, competing VoIP traffic degrades
- a little added latency is equivalent to dropping with VoIP.  That
translates to dropouts in the audio.  Acceptable for hackers talking
over a flakey line, but not corporate telephony.

At Larry's server, inbound connection rate resembles a low-level SYN
flood, which is enough to poke holes in VoIP latency.

Of course the real problem is lack of end to end QoS between Larry's
nodes.  Two T1s is just a workaround :)

-- Jamie

  reply	other threads:[~2003-09-01  0:50 UTC|newest]

Thread overview: 71+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <q2SH.AA.3@gated-at.bofh.it>
     [not found] ` <qfwI.15D.27@gated-at.bofh.it>
     [not found]   ` <qgCn.2y4.11@gated-at.bofh.it>
2003-08-30 22:58     ` bandwidth for bkbits.net (good news) Pascal Schmidt
2003-08-30 23:07       ` Larry McVoy
2003-08-31  1:05         ` Pascal Schmidt
2003-08-31  1:39           ` Andrea Arcangeli
2003-08-31  2:18             ` Jeff Sipek
2003-08-31  2:42               ` Andrea Arcangeli
2003-08-31  2:56             ` Larry McVoy
2003-08-31 13:15               ` Alan Cox
2003-08-31 14:45                 ` Andrea Arcangeli
2003-08-31 15:31                   ` Alan Cox
2003-08-31 15:43                     ` Jörn Engel
2003-08-31 15:50                       ` Andrea Arcangeli
2003-08-31 17:06                         ` Florian Weimer
2003-08-31 21:21                           ` Larry McVoy
2003-09-02  7:06                           ` Henning P. Schmiedehausen
2003-09-05  8:10                             ` Florian Weimer
2003-09-05 15:35                               ` Henning Schmiedehausen
2003-09-05 15:50                                 ` Florian Weimer
2003-09-05 16:10                                 ` P
2003-09-05 16:43                                 ` Ricky Beam
2003-09-07 11:55                                   ` Henning Schmiedehausen
2003-09-07 18:41                                     ` Ricky Beam
2003-09-08  8:57                                       ` [COMPLETELY OFF-TOPIC] " Henning Schmiedehausen
2003-09-02 21:52                           ` Ricky Beam
2003-09-05  8:16                             ` Florian Weimer
2003-08-31 15:44                     ` Andrea Arcangeli
2003-08-31 16:22                       ` Larry McVoy
2003-08-31 16:33                         ` Andrea Arcangeli
2003-08-31 16:48                           ` Larry McVoy
2003-08-31 17:06                             ` Andrea Arcangeli
2003-08-31 21:18                               ` Larry McVoy
2003-08-31 22:49                                 ` Andrea Arcangeli
2003-08-31 22:52                                   ` Alan Cox
2003-08-31 22:58                                     ` Larry McVoy
2003-08-31 23:02                                     ` Andrea Arcangeli
2003-08-31 23:07                                       ` Larry McVoy
2003-08-31 23:22                                         ` Andrea Arcangeli
2003-09-01  0:12                                           ` Larry McVoy
2003-09-01  0:19                                             ` Jamie Lokier
2003-09-01  0:33                                               ` Larry McVoy
2003-09-01 11:43                                           ` Alan Cox
2003-09-01 16:13                                             ` Andrea Arcangeli
2003-09-01 16:24                                               ` Larry McVoy
2003-09-01 16:28                                               ` Alan Cox
2003-09-01 16:38                                                 ` Andrea Arcangeli
2003-08-31 23:39                                     ` Roman Zippel
2003-09-01  0:09                                       ` Larry McVoy
2003-09-01  0:20                                         ` Larry McVoy
2003-08-31 22:56                                   ` Larry McVoy
2003-08-31 23:13                                     ` Andrea Arcangeli
2003-09-01  0:18                                       ` Jamie Lokier
2003-09-01  0:25                                         ` Larry McVoy
2003-09-01  0:28                                         ` Andrea Arcangeli
2003-09-01  0:50                                           ` Jamie Lokier [this message]
2003-09-01  1:10                                             ` Andrea Arcangeli
2003-09-01  1:33                                               ` Larry McVoy
2003-09-02  7:11                                   ` Henning P. Schmiedehausen
2003-09-02  7:01                       ` Henning P. Schmiedehausen
2003-08-31 16:23                     ` Larry McVoy
2003-08-31 16:36                       ` Andrea Arcangeli
2003-08-31 15:38                   ` Jörn Engel
2003-09-02  6:55               ` Henning P. Schmiedehausen
2003-08-31 13:47             ` Pascal Schmidt
2003-08-31 14:51               ` Andrea Arcangeli
2003-09-02  6:53           ` Henning P. Schmiedehausen
2003-08-31  6:30       ` Jörn Engel
     [not found] <qn1b.2Pr.29@gated-at.bofh.it>
     [not found] ` <qoTh.5mt.11@gated-at.bofh.it>
     [not found]   ` <rdje.1sH.11@gated-at.bofh.it>
2003-09-02 17:49     ` Pascal Schmidt
2003-08-30  1:29 Larry McVoy
2003-08-30 15:03 ` Larry McVoy
2003-08-30 16:10   ` Jörn Engel
2003-08-31 10:13   ` Toon van der Pas

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