Re: [67ATTENDEES] Anyone get the 'broadband' connection in the IETF hotel
Fred Baker <fred@cisco.com> Wed, 08 November 2006 20:43 UTC
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From: Fred Baker <fred@cisco.com>
Subject: Re: [67ATTENDEES] Anyone get the 'broadband' connection in the IETF hotel
Date: Wed, 08 Nov 2006 12:43:51 -0800
To: "<john.loughney@nokia.com>" <john.loughney@nokia.com>
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So you may find this interesting. Last night, at 6:30, I started a ping study from my room to a computer back at "the ranch". You may look at the pictures at ftp://ftpeng.cisco.com/fred/sheraton/ping-study-11-7-rtt.htm There are two charts, one of the ping RTT distribution, and one of the per-minute minimum, average, maximum, standard deviation, and percentage of loss. You flip between them (yes, this was done using Excel) by clicking on "chart1" and "chart2". The second is displayed on a log-linear chart, because the upper bound value is a 35 second RTT on a ping that happened a bit after 11:00 last nightand it would be really nice to be able to see the normal samples, which are in the 60-500ms range. The delay distribution chart is interesting in this way: the 90% confidence delay is shown in the chart; the last 10% has samples, as I said, all the way from 750 ms to 35 seconds. But instead of the typical Poisson distribution in which 90% of cases are within zero and twice the mean, there is a big bump around the mean and a really long and pronounced tail in which there is a very high probability that delay on a packet is many times the mean RTT. I would guess that your average TCP is probably unnecessarily retransmitting a significant percentage of its transmissions simply because of wildly varying delay. Basically, last night, there was a significant delay bump from 10:00 PM to 1:30 AM and another one from about 6:00 AM to 8:00 AM. Surprise. 10:00 is about when we got back from the social, dinner, or whatever else we did last night, and 6:00-8:00 is when we are all in our rooms and haven't yet materialized downstairs for coffee. Something about having 1000 internet geeks walk into a hotel that is designed for executive travelers and wonder what's happening back home :-) _______________________________________________ 67ATTENDEES mailing list 67ATTENDEES@ietf.org https://www1.ietf.org/mailman/listinfo/67attendees
- [67ATTENDEES] Anyone get the 'broadband' connecti… john.loughney
- Re: [67ATTENDEES] Anyone get the 'broadband' conn… Yangwoo Ko
- Re: [67ATTENDEES] Anyone get the 'broadband' conn… Marshall Eubanks
- Re: [67ATTENDEES] Anyone get the 'broadband' conn… Clint Chaplin
- Re: [67ATTENDEES] Anyone get the 'broadband' conn… Andrew G. Malis
- RE: [67ATTENDEES] Anyone get the 'broadband' conn… Yi Zhao
- Re: [67ATTENDEES] Anyone get the 'broadband' conn… Mark Andrews
- Re: [67ATTENDEES] Anyone get the 'broadband' conn… Roland Bless
- Re: [67ATTENDEES] Anyone get the 'broadband' conn… Fred Baker
- Re: [67ATTENDEES] Anyone get the 'broadband' conn… Simon Leinen