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From: "David Boreham" <david_list@boreham.org>
To: lartc@vger.kernel.org
Subject: Re: [LARTC] how to get the latency down on maxed out classes?
Date: Mon, 09 Dec 2002 18:39:12 +0000	[thread overview]
Message-ID: <marc-lartc-103945912231333@msgid-missing> (raw)
In-Reply-To: <marc-lartc-103926701306950@msgid-missing>

> Similarly, I don't understand the latency issue.  An application that
> cares about latency will not create a large backlog.

I think the problem may be that a TCP flow will create a queue
of packets, behind which all other packets queue. Thus one sees
200ms latency via 'ping'. Of course this is exactly what you would
see on a real connection of the specified throttled speed (e.g. a 
DSL line). However it seems to surprise folks that there's a relationship
between throughput and latency. They expect to be able to throttle
traffic to 100Kbits, but still see 5ms latency. Without special
measures that isn't going to happen.


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      parent reply	other threads:[~2002-12-09 18:39 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-12-07 13:15 [LARTC] how to get the latency down on maxed out classes? Abraham van der Merwe
2002-12-07 13:43 ` hare ram
2002-12-07 15:15 ` Stef Coene
2002-12-07 16:49 ` Abraham van der Merwe
2002-12-08 12:09 ` Stef Coene
2002-12-08 16:27 ` David Boreham
2002-12-08 17:30 ` Don Cohen
2002-12-09 16:11 ` Abraham van der Merwe
2002-12-09 16:44 ` Don Cohen
2002-12-09 18:39 ` David Boreham [this message]

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