[ovs-dev] Hitless resynchronisation of forwarding state

Jan Scheurich jan.scheurich at ericsson.com
Mon Aug 8 22:46:34 UTC 2016


> From: Jarno Rajahalme [mailto:jarno at ovn.org]
> Sent: Friday, 29 July, 2016 20:38
> 
> > Twice the memory of the steady state footprint would still be a significant
> burden, in particular if that memory would have to reside on hugepages that
> are statically reserved for ovs-vswitchd. I must say I haven't fully understood
> which part of the OVS data structures are actually allocated from hugepage
> memory when running OVS with DPDK netdev datapath. Can you clarify this?
> >
> Not an expert on huge pages myself, but I asked around and was told DPDK use
> of huge pages does not affect the size of pages used for the rest of OVS
> userspace.

I have seen that ofproto data structures are not allocated from hugepage memory. So that should be OK.

> I have just posted a new patch series that implements both group support and
> also reduces the memory burden of bundle message storage and execution. I
> have not tested how much this helps, and would be happy if you could repeat
> your testing with the new patch series.
> 
> Either way, the patch series should make it's way to OVS 2.6.

Thanks a lot for that effort. I have seen that it is on master already. We will give the new bundle implementation a try, also including groups, and report the numbers.

BR, Jan



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