I have an htb qdisc setup and it is shaping my traffic wonderfully but I''ve just recently started taking a look at the output from the command tc -s class ls dev eth? Looking at the "rate" line I thought to myself..."cool I can use this to graph throughput avg.es without having to worry about the "Sent bytes" rolling over or being lost when the htb qdisc is recreated" _BUT_ it seems the rates are inaccurate. When I look at the rate my cisco router reports for a 5min avg and I look at a calculated 5min average (30 polls of the tc once every 10sec) for tc they are very different. The cisco is reported as ~2090kb/s and tc reports my parent as ~251kb/s. Even if I take all the classes separately and add the averages together I get closer but not that much closer. Is my math wrong? How does the tc/htb qdisc figure the avg. rate? -- David DeLauro Talk sense to a fool and he calls you foolish. - Euripides Those who do not think about their own sins make up for it by thinking incessantly about the sins of others. - C. S. Lewis (God in the Dock, "Miserable Offenders," p. 124) Never undertake anything for which you wouldn''t have the courage to ask the blessing of heaven. - G. C. Lichtenberg (1742-1799) _______________________________________________ LARTC mailing list / LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
David, : When I look at the rate my cisco router : reports for a 5min avg and I look at a calculated 5min average (30 polls : of the tc once every 10sec) for tc they are very different. The cisco is : reported as ~2090kb/s and tc reports my parent as ~251kb/s. : Even if I take all the classes separately and add the averages together : I get closer but not that much closer. Is my math wrong? How does the : tc/htb qdisc figure the avg. rate? $ expr 251 \* 8 2008 Snipped from http://www.docum.org/stef.coene/qos/docs/ : "When you use the tc command, you have to remember that mb = 1024 kb 1024 * 1024 b = byte/s and that mbit = 1024 kbit = 1024 * 1024 bit bit/s." Snipped from http://lartc.org/howto/lartc.qdisc.html : "Just to prevent confusion, tc uses the following rules for bandwith specification: mbps = 1024 kbps = 1024 * 1024 bps => byte/s mbit = 1024 kbit => kilo bit/s. mb = 1024 kb = 1024 * 1024 b => byte mbit = 1024 kbit => kilo bit.! Are you certain your units are the same? Strangely, the tc command line tool uses kb for kilobytes/second. I think 251 kilobytes-per-second is quite close to 2090 kilobits-per-second. Bye for now, -Martin -- Martin A. Brown --- SecurePipe, Inc. --- mabrown@securepipe.com _______________________________________________ LARTC mailing list / LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
On Tue, 4 Feb 2003 At 10:20 -0600, mabrown-lartc@securepipe.com Articulated:> > Snipped from http://lartc.org/howto/lartc.qdisc.html : > > "Just to prevent confusion, tc uses the following rules for bandwith > specification: > > mbps = 1024 kbps = 1024 * 1024 bps => byte/sThanks Martin... I was running under the assuption that "bps" was bits/s and "Bps" was bytes/sec... peace -- David DeLauro Hata ukinichukia la kweli nitakwambia - Kanga Proverb Apart from God every activity is merely a passing whiff of insignificance. - Alfred North Whitehead (1861-1947) Never undertake anything for which you wouldn''t have the courage to ask the blessing of heaven. - G. C. Lichtenberg (1742-1799) _______________________________________________ LARTC mailing list / LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
On Tuesday 04 February 2003 17:30, David DeLauro wrote:> On Tue, 4 Feb 2003 At 10:20 -0600, mabrown-lartc@securepipe.com Articulated: > > Snipped from http://lartc.org/howto/lartc.qdisc.html : > > > > "Just to prevent confusion, tc uses the following rules for bandwith > > specification: > > > > mbps = 1024 kbps = 1024 * 1024 bps => byte/s > > Thanks Martin... > > I was running under the assuption that "bps" was bits/s and "Bps" was > bytes/sec...It''s bit when there is bit, otherwise it''s byte :) Stef -- stef.coene@docum.org "Using Linux as bandwidth manager" http://www.docum.org/ #lartc @ irc.oftc.net _______________________________________________ LARTC mailing list / LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/