21 Sep
2016
21 Sep
'16
4:12 p.m.
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Change is the end result of all true learning.- Leo Buscaglia
-----Original Message-----
From: 44Net
[mailto:44net-bounces+arnold.villeneuve=rogers.com@hamradio.ucsd.edu] On
Behalf Of Marius Petrescu
Sent: September-21-16 3:55 PM
To: AMPRNet working group <44net(a)hamradio.ucsd.edu>
Subject: Re: [44net] ampr-ripd update 1.14
(Please trim inclusions from previous messages)
_______________________________________________
Actually let me correct that statement, which is wrong:
The only difference is the fact that the raw socket will deliver the
complete ethernet frames for all IPIP traffic instead of just the data
content of that specific 44.0.0.1 source.
The only overhead is the fact that it needs to compare ip source,
destination and ports, instead of relying on the kernel to that operation
(the protocol filtering is handled by the kernel in both cases either at
socket level in multicast mode or by socket read in raw mode, where protocol
4 is used as a filter, which I think has the same effect).
So unless there is a lot of other IPIP traffic on the machine, there is
almost no overhead (4 integer comparation and a pointer operation per IPIP
packet - this should be no problem for any modern computer or even an
embedded system).
Another side effect is that the tunnel interface will not send IGMP group
join messages to ampr-gw, but this is not needed and has no impact at all.
On 2016-09-21 22:36, Marius Petrescu wrote:
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_______________________________________________
Actually there is almost no processing overhead involved.
It is just that it gets the whole uscd tunnel traffic instead of the
multicasts only and has to filter it by the protocol field, which is
very fast. And in basic conditions, that traffic is usually low.
Anyway, I would say: if one wants multicast, then version 1.14 is the
one. If not, 1.15 will do.
Marius, YO2LOJ
On 2016-09-21 22:04, Rob Janssen wrote:
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_______________________________________________
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44Net mailing list
44Net(a)hamradio.ucsd.edu
http://hamradio.ucsd.edu/mailman/listinfo/44net Subject:
Re: [44net] ampr-ripd update 1.14
From:
Marius Petrescu <marius(a)yo2loj.ro>
Date:
09/21/2016 06:59 PM
To:
AMPRNet working group <44net(a)hamradio.ucsd.edu>du>, "Ana C. Custura"
<ana(a)netstat.org.uk>
On my server running Debian 8 with kernel 3.16.0-4-amd64 it works
without the '-r' flag.
I actually wanted to remove that flag, but then it will break the
scripts using it.
I will make a new release that ignores that flag but still accepts
it as parameter, but runs always in raw mode.
I think this would be the proper approach.
Ok, the multicast mode of course is a
good thing, but it has caused
some strange behaviour in the past. You could of course keep the old
code in there using some #ifdef option for those
that want to try it. Or introduce a new flag that switches from raw
to multicast mode.
Raw mode always works, but in some cases may have some more CPU
overhead. Not sure if it is a noticable difference...
Rob
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