On Wed, 2015-09-09 at 17:34 -0400, Sowmini Varadhan wrote:
> I'm doing some experiments that are trying to simultaneously
> scaling the number of CPUs, and the number of processes
> and encountering getifaddrs() weaknesses.
>
> Others have run into similar things in the past, e.g.,
> http://lists.openwall.net/netdev/2014/01/23/119
> and more relevant to my experiment: the findings behind
> the recent commit a3a77372.
>
> In my case, it looks like getifaddrs() doesnt even use the
> results of IFLA_INET6_STATS or IFLA_INET6_ICMP6STATS-
> from my scan of glibc, this information is ignored (it only
> looks at IFLA_STATS). Moreover, if I hack out all of
> snmp_fold_field() (so that it always returns 0), it helps
> my cpu utilization and scaling, and no errors are reported.
>
> So the question is- who uses IFLA_INET6_STATS/IFLA_INET6_ICMP6STATS?
> Is this intended for some ND/ripngd etc daemon? Doesnt seem to
> be documented in rtnetlink(7), and couldnt find any users in glibc,
> and google did not find any usage.
At least ICMP6 stats do not have O(Ncpu) cost anymore,
after commit be281e554e2a4cf2478df7a8b8926c89454bccfa
("ipv6: reduce per device ICMP mib sizes")
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