Re: [PATCH RFC 0/2] Optimize the snmp stat aggregation for large cpus

[Eric Dumazet]

On Tue, 2015-08-25 at 13:24 +0530, Raghavendra K T wrote:
> While creating 1000 containers, perf is showing lot of time spent in
> snmp_fold_field on a large cpu system.
> 
> The current patch tries to improve by reordering the statistics gathering.
> 
> Please note that similar overhead was also reported while creating
> veth pairs  https://lkml.org/lkml/2013/3/19/556
> 
> Setup:
> 160 cpu (20 core) baremetal powerpc system with 1TB memory

I wonder if these kind of results would demonstrate cache coloring
problems on this host. Looks like all the per cpu data are colliding on
same cache lines.


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