[ClusterLabs] EL6, cman, rrp, unicast and iptables

Christine Caulfield ccaulfie at redhat.com
Mon Sep 14 08:44:51 EDT 2015

On 14/09/15 12:45, Noel Kuntze wrote:
> Hello Christine,
>> I think it's worth mentioning here that corosync already sets its
>> packets to TC_INTERACTIVE (which DLM does not), so they should not need
>> too much messing around with in iptables/qdisc
> If that is the case, then why do the totem messages timeout?
> Corosync is already running with realtime priority and its packets are delivered instantly,
> because they get put into band 0. So what's the problem here then, if it's not
> too much traffic? Do you have an idea?

TBH I don't honestly know for sure. I don't think TC_INTERACTIVE is any
sort of guarantee of 'instant' delivery, just a hint to the kernel as to
relative priorities. If there is a huge amount of DLM traffic then that
still need to happen somehow. But really we ought to get input from
someone who knows more about the kernel networking internals than me :)


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