[MVMA] Recent upgrade DARA <> MVHS 13.5 miles

[Chuck Gelm]

On 11/29/2018 09:25 AM, Moe wrote:
>
>
>> On Nov 29, 2018, at 05:37, Chuck Gelm <nc8q-mesh at gelm.net 
>> <mailto:nc8q-mesh at gelm.net>> wrote:
>>
>> I read that you want 'tweak' an existing*100% LQ link*and this desire 
>> is*priority one*("at the earliest weather opportunity").
>
> Chuck, since *100% LQ* is your Holy Grail, let me note it is at times 
> <100% at MVHS NSM5.
>
> from Joe Ayers, AE6XE:
>
> LQ/NLQ is not really a good indicator of the
> performance you will get over a channel/link.  The LQ/NLQ is
> determined based on UDP broadcast packets.  This means they are always
> transmitted at slowest link rate, typically 1Mbps and do not use
> CTS/RTS protocols to clear the channel and ensure delivery, like a
> video or voip stream would use.
>
> There are 2 data points to measure a quality link or path A to B
> across a mesh network:
>
> 1) the latency is low -- which is significant for VOIP
> 2) *the throughput is maximized or great**
> *
> LQ/NLQ isn't a good measure of ether of these.  To measure the
> performance, use the following, to respectively test improvements when
> changes are made:
>
> 1)  ping time
> 2)  iperf throughput.
>
>
Hi, Moe:

  Okay, I will re-phrase.

  I read that you want to '*increase the throughput*' an existing *solid 
link* and this desire is *priority one* ("at the earliest weather 
opportunity").

*1) ping time*:
I read that a 7 ms latency can be improved with an increase in SNR/MCS 
and this improvement in latency is worth consuming a weather opportunity 
day.
-----

 From my node at MVHS to W8GUC:

root at NC8Q-NS-M3-180:~# traceroute w8guc
traceroute to w8guc (10.74.68.51), 30 hops max, 38 byte packets
  1  dtdlink.KE8MVM-MVHS-NSM5.local.mesh (10.109.208.226) 0.453 ms  
0.325 ms  0.336 ms
  2  KE8MVM-AGHP5G27-at-DARA.local.mesh  (10.174.15.186) 2.270 ms  5.497 
ms  2.567 ms
  3  dtdlink.W8BI-DARA-Omni.local.mesh   (10.79.204.59) 2.328 ms  2.151 
ms  5.545 ms
  4  W8GUC.local.mesh                    (10.74.68.51) *3.747 ms  5.784 
ms  7.211 ms*
root at NC8Q-NS-M3-180:~#

Chuck

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