Re: [manet-dlep-rg] Latency

On Nov 12, 2013, at 10:27 AM, Henning Rogge <hrogge@googlemail.com> wrote:

> 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" ?

That sounds right to me. 

Regards,
Stan

> 
> Henning Rogge
> 
> On Tue, Nov 12, 2013 at 2:43 PM, Taylor, Rick <Rick.Taylor@cassidian.com> 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: manet-dlep-rg-bounces@ietf.org [mailto:manet-dlep-rg-
>>> bounces@ietf.org] On Behalf Of Henning Rogge
>>> Sent: 12 November 2013 13:23
>>> To: Teco Boot
>>> Cc: DLEP Research Group (manet-dlep-rg@ietf.org); 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 <teco@inf-net.nl> wrote:
>>>> 
>>>> Op 11 nov. 2013, om 01:55 heeft Stan Ratliff (sratliff)
>>> <sratliff@cisco.com> 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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>>> 
>>> 
>>> 
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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