[CUWiN-Dev] Re: tdv - interesting behavior

[Matthew Isaacs]

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Matthew Isaacs wrote:
> As part of some work on tdv today, we would up with multiple gateways to
> a cloud.  It worked fine for a while; quite nicely, actually.  Then, at
> some point, things stopped working.  Some investigation reveals that the
> likely culprit is hsls taking all the cpu.  When things were working,
> load averages are under 1.0; when things broke, they had climbed to over
> 1.5 and were using 100% of the cpu.  I have no idea why hsls is taking
> some much cpu.  The routes look fine.  The only thing I found that
> looked odd were the etx metric associated with each route.  I'm assuming
> that etx is like most metrics in that a lower cost means a better route.
>  According to the linkstates table, however, the cost associated with
> the ethernet on the gateways is set to the maximum cost (65536).
> Restarting hsls does not seem to affect it.  tcpdump shows a large
> amount of traffic on the wireless being generated by hsls; it appears
> that the nodes are both able to send and receive.  My guess is that hsls
> is simply using the radio too much to allow other traffic to pass.
> 
> I know we're working on gateway selection, and that has its merits.
> However, I was thinking and such a mechanism isn't required in
> traditional routing; the routing protocol and an appropriate metric deal
> with that.  Additionally, this was working for 5 hours today before
> things started causing problems.
> 
> For the time being I'm just going to group things into clouds, but I'd
> be interested in people's thoughts on this.
> 
> --Matt

OK.  I seem to have resolve the problem.  The folks on the ground
brought up a node or two with an old version of CUWIN that was wreaking
havoc on the gateway nodes.  Once I got them upgraded, the problems
appear to have been resolved.
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