[WT-support] Network LogSync problems...

[Laurent HAAS - F6FVY]

Hi Mario et al.

Le 04/09/2013 00:44, Mario Lorenz a écrit :

> question: At this year's IARU HF, we have seen severe problems with
> network logsync. Essentially QSO numbers didnt match at all, there was
> quite significant traffic, but things were so bad that chat messages
> even vanished on the local LAN.

(snip)

> Have there been any changes in the networking / logsync code in the last
> versions ? (I'm not doing this test for each version, but I'd wager
> 4.7 and possibly (not sure) 4.9 we didnt observe this.

There has been no major modification on this part of the code, except 
the various improvements regarding the bridgehead concept to decrease 
network traffic in the LANs.

Actually, the sync code and concept is not tailored at all to run the 
test case you described (and tried) : Having one "master log" only, of 
several thousands of Q, and 11 (!!!) other *empty* logs to sync together 
is not a realistic view of what is happening in the real life. This 
generates a HUGE traffic, and as the frames are UDP only as you know, no 
doubt some of your chit-chat (gab) frames were lost ! Also, except if I 
misunderstood, no doubt that disconnecting the "master log" while none 
of the 11 other machines is sync, will definitely lead to incomplete 
logs. But, once again, it has _not_ been designed for this kind of 
configuration.

For the record, we didn't observe any particular bad behavior this year 
at TM0HQ. Once everything was correctly configured (one - and only one - 
PC configured as a bridgehead per LAN, one - and only one - wtTunnel 
client per LAN, etc.), everything ran smoothly, despite some losses of 
connection to the tunnel server.

I understand the sync process could be improved or even redesigned to 
fit this kind of configuration / usage, but I will personally not take 
this risk for such rare occasions. And also, I'm not the former author 
of this part of the Win-Test code, which doesn't help.

73

Larry - F6FVY

-- 
If you're not paying for something, you're not the customer; you're the 
product being sold.- Andrew Lewis