From: Peteris Krumins <newsgroups@lf.lv>
To: lartc@vger.kernel.org
Subject: Re[2]: [LARTC] (simplified) Rate precision
Date: Mon, 03 Nov 2003 11:34:16 +0000 [thread overview]
Message-ID: <marc-lartc-106785972330482@msgid-missing> (raw)
Monday, November 3, 2003, 2:37:26 AM, you wrote:
AK> Am Saturday 01 November 2003 21:32 schrieb Peteris Krumins:
>> i wrote a few days ago but did not receive any answers.
AK> I did not receive/read this mail.
That one was about limits and data precision.
>> The example above should shape the speed to 2mbit (2048kbit)
>> but unfortunately the real speed is only 1920kbit..
AK> How exactly do you measure the 'real speed'? The difference sounds much like
AK> overhead of some sort that you're not accounting properly. For example, when
AK> using scp to copy files over the line, it would be normal to have lower
AK> transfer rates than the actual line speed, because there's some kind of
AK> handshake/encryption overhead with every package sent.
Via ftp.
If I perform the tests using tbf attached to a class then the rate is
precise. For example, if I measure rate of 256kbit using sfq and then
tbf, sfq is always wrong at
(actual_rate/rate_set)
240kbit/256kbit = 0,9375 = 6,25%
1920kbit/2048kbit = 0,9375 = 6,25%
I performed several tests at different data rates and the innacuracy
of 6,25 percent always remain.
P.Krumins
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reply other threads:[~2003-11-03 11:34 UTC|newest]
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