Re: [manet-dlep-rg] Latency

[Henning Rogge <[e-mail]>]

How much resolution do we need?

It milliseconds enough, or do we need to do better? Maybe 32 bit
integer in microseconds? That would give us enough precision but also
allows for high-delay radios.

*looking at Stan's reply* rolling latency sounds reasonable, so its
similar to the "control package RTT" Rick Taylor told us about?

So we are looking for a value that means "rough estimate of the time
between IP packet got delivered to radio and IP packet leaves other
radio" ?

Henning Rogge

On Tue, Nov 12, 2013 at 2:43 PM, Taylor, Rick <[e-mail]> wrote:
> From my experience:
>
> My test DLEP devices just make up a number (not very helpful)
>
> The radios I have used that support DLEP-00 natively report a latency in ms.  What that really is I have no idea.  Again, not very useful.
>
> I have my own DLEP proxy for some other radios, and I have just reported half of RTT on my control packets, which given I have jitter and back-off, again isn't very useful.
>
> BUT, Having a latency metric, even if it is almost meaningless, is better than no metric at all.
>
> I could suggest 100ms * hop-count works in mesh radios, as one of the simplest uses of latency is as an improved hopcount for split-horizoning in routing protocols.
>
> It's amazing what one will try to use, even if the quality of the data is very poor!
>
> Rick Taylor
>
>> -----Original Message-----
>> From: [e-mail] [mailto:manet-dlep-rg-
>> [e-mail]] On Behalf Of Henning Rogge
>> Sent: 12 November 2013 13:23
>> To: Teco Boot
>> Cc: DLEP Research Group ([e-mail]); Stan Ratliff
>> Subject: Re: [manet-dlep-rg] Latency
>>
>> Yes, I heard this too in the MANET Meeting...
>>
>> which made me wonder a bit because I was puzzled what was the
>> difference between the two.
>>
>> Can maybe the people who already have an implementation for DLEP tell
>> us what kind of Latency they implemented?
>>
>> Henning Rogge
>>
>> On Mon, Nov 11, 2013 at 5:15 PM, Teco Boot <[e-mail]> wrote:
>> >
>> > Op 11 nov. 2013, om 01:55 heeft Stan Ratliff (sratliff)
>> <[e-mail]> het volgende geschreven:
>> >
>> >> Point 11 - I didn't hear that. Really, I didn't hear any conclusions
>> about Latency. Other opinions?
>> >
>> > We discussed it and all speakers said it is an important metric, so it
>> will be an optional TLV in core document.
>> >
>> > Wasn't Henning tasked with verifying Latency and EFT?
>> >
>> > Teco
>> >
>> > _______________________________________________
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>> > [e-mail]
>> > https://www.ietf.org/mailman/listinfo/manet-dlep-rg
>>
>>
>>
>> --
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-- 
We began as wanderers, and we are wanderers still. We have lingered
long enough on the shores of the cosmic ocean. We are ready at last to
set sail for the stars - Carl Sagan