linux-kernel - RE: Slowness forming TIPC cluster with explicit node addresses

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Message-ID: <CH2PR15MB35754D65AB240A74AE488E719AC00@CH2PR15MB3575.namprd15.prod.outlook.com>
Date:   Fri, 26 Jul 2019 13:31:33 +0000
From:   Jon Maloy <jon.maloy@...csson.com>
To:     Chris Packham <Chris.Packham@...iedtelesis.co.nz>,
        "tipc-discussion@...ts.sourceforge.net" 
        <tipc-discussion@...ts.sourceforge.net>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: Slowness forming TIPC cluster with explicit node addresses



> -----Original Message-----
> From: netdev-owner@...r.kernel.org <netdev-owner@...r.kernel.org> On
> Behalf Of Chris Packham
> Sent: 25-Jul-19 19:37
> To: tipc-discussion@...ts.sourceforge.net
> Cc: netdev@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: Slowness forming TIPC cluster with explicit node addresses
> 
> Hi,
> 
> I'm having problems forming a TIPC cluster between 2 nodes.
> 
> This is the basic steps I'm going through on each node.
> 
> modprobe tipc
> ip link set eth2 up
> tipc node set addr 1.1.5 # or 1.1.6
> tipc bearer enable media eth dev eth0

eth2, I assume...

> 
> Then to confirm if the cluster is formed I use tipc link list
> 
> [root@...e-5 ~]# tipc link list
> broadcast-link: up
> ...
> 
> Looking at tcpdump the two nodes are sending packets
> 
> 22:30:05.782320 TIPC v2.0 1.1.5 > 0.0.0, headerlength 60 bytes, MessageSize
> 76 bytes, Neighbor Detection Protocol internal, messageType Link request
> 22:30:05.863555 TIPC v2.0 1.1.6 > 0.0.0, headerlength 60 bytes, MessageSize
> 76 bytes, Neighbor Detection Protocol internal, messageType Link request
> 
> Eventually (after a few minutes) the link does come up
> 
> [root@...e-6 ~]# tipc link list
> broadcast-link: up
> 1001006:eth2-1001005:eth2: up
> 
> [root@...e-5 ~]# tipc link list
> broadcast-link: up
> 1001005:eth2-1001006:eth2: up
> 
> When I remove the "tipc node set addr" things seem to kick into life straight
> away
> 
> [root@...e-5 ~]# tipc link list
> broadcast-link: up
> 0050b61bd2aa:eth2-0050b61e6dfa:eth2: up
> 
> So there appears to be some difference in behaviour between having an
> explicit node address and using the default. Unfortunately our application
> relies on setting the node addresses.

I do this many times a day, without any problems. If there would be any time difference, I would expect the 'auto configurable' version to be slower, because it involves a DAD step.
Are you sure you don't have any other nodes running in your system?

///jon


> 
> [root@...e-5 ~]# uname -a
> Linux linuxbox 5.2.0-at1+ #8 SMP Thu Jul 25 23:22:41 UTC 2019 ppc
> GNU/Linux
> 
> Any thoughts on the problem?