Re: [Roll] ETX metric

[Alexandru Petrescu <alexandru.petrescu at gmail.com>]

Philip Levis a écrit :
> On Oct 15, 2009, at 12:49 PM, Alexandru Petrescu wrote:
>
> > Philip Levis a écrit :
> > > On Oct 15, 2009, at 12:27 PM, Alexandru Petrescu wrote:
> > > > Philip Levis a écrit :
> > > > > I think we should keep in mind that RPL must work across multiple 
> > > > > link layers. E.g.:
> > > > > A -- 900MHz --> B -- 2.4GHz --> C
> > > > > ETX is a commonly used metric,
> > > >
> > > > Philip, what do you mean by "ETX commonly used metric"?
> > > >
> > > > Could you please explain, in implementation terms.
> > > >
> > > > Could you list some widely available software in solid software 
> > > > distributions, widely deployed, and using this ETX metric?
> > > MIT Roofnet/srcr: http://pdos.csail.mit.edu/roofnet/software.php
> > > CTP: 
> > > http://tinyos.cvs.sourceforge.net/viewvc/tinyos/tinyos-2.x/tos/lib/net/ctp/ 
> > >
> > > OLSR: http://www.olsr.org/docs/README-Link-Quality.html
> >
> > Ah the World Wide Web, h t t p something, wikipedia and google and we 
> > know everything...
> >
> > The software being on a website doesn't tell anything about how much 
> > it is used.
> >
> > How about software which is not on h t t p something yet it runs ok.
>
> Meraki's technology is based on srcr (the Roofnet students from MIT 
> founded Meraki). Not an IETF standard, but a mesh protocol running on 
> 13,000+ networks, serving >4,000,000 clients. Srcr uses ETX/ETT.

Philip - how about some metric about which _you_ feel like you'd 
implement ok, and about which you feel like many people would agree 
with, and about which _you_ feel some people may need, and some usecases 
may need.

(sorry being too direct to 'you', but that's what I mean, and no
 offence).

Alex