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Re: [vmeet] Experience as a remote attendee

Martin J. Dürst <duerst@it.aoyama.ac.jp> Mon, 11 April 2016 08:17 UTC

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To: Simon Pietro Romano <spromano@unina.it>
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Subject: Re: [vmeet] Experience as a remote attendee
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Hello Simon,

On 2016/04/11 05:11, Simon Pietro Romano wrote:

> As a final remark, I would like to highlight the fact that the connection from BA to Italy was showing a really weird behavior in terms of network performance as a function of the time of the day. And this is something I have not been able to fully understand (even though I teach an Advanced Computer Networks class since 1998 ;-) ). I am still investigating this, by looking at things like BGP route flapping, time-dependent traffic shaping policies — at the firewall level — on the Italian Research backbone and/or at the ingress router of my University campus network, etc..
>
> To give you an idea of what I am talking about, I’ll provide you with some side information:
>
> - we record all Meetecho sessions on-site (i.e., this time, in BA);
> - at the end of each slot (lunch break and end of the day) we transfer, via scp (secure copy command) all recorded files to a backend server hosted in Italy;
> - the lunch-time transfers happened at an average speed of more than 4MB/sec;
> - evening (in BA, which means night time in Italy) transfers happened at less than 50KB/sec, which is astonishingly less than the other figure above;
> - a basic “ping” from BA to Italy resulted in around 300 msec estimated round-trip time during day and more than 500 msec at nights.

You call such daily variations "weird", but aren't they pretty usual? 
People don't use the Internet with the same intensity all day round. 
Depending on the overall usage profile, usage will be higher during 
business hours, or during leisure hours. With video these days 
contributing a lot to overall bandwidth consumption, usage during 
leisure hours can easily get higher than during business hours.

Regards,   Martin.

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