[CFT] modular kernel config

Łukasz Wąsikowski lukasz at wasikowski.net
Tue Feb 28 22:13:14 UTC 2012

W dniu 2012-02-28 22:56, Łukasz Wąsikowski pisze:

>>>>> FLOWTABLE on 8.x crashed BGP routers (kern/144917).
>>>> no crash dump, no backtrace, no follow-up whatsoever after 1 year and
>>>> 2 years, what's your points ? You could really have chosen a better PR
>>>> to back up your argument...
>>> Sorry, but I don't want to bug trace this issue, simply because lack of
>>> time, resources and interest in this feature. I've run into this bug on
>>> production box, went through hell because of it and turned off flowtable
>>> which I do not use and not need. If this problem is still alive (it
>>> might be, the PR I've mentioned is still open) then it's not a good idea
>>> to turn on this feature by default. If you're interested in using this
>>> feature then feel free to debug and test.
>> Give me a deterministic way to reproduce the issue and I will.
> Enable FLOWTABLES in kernel and setup BGP4+ router (with net/quagga).
> You need three peers sending you full Internet routing table (3x400k
> prefixes). Some people got it with only two peers. After a short while
> your CPU should stuck in 100% busy.

I forgot one thing which may be important. IP addresses used for BGP
sessions was heartbeated. So you first need to use those addresses on
another box, then move them to flowtable box and run quagga with BGP on it.

best regards,
Lukasz Wasikowski

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