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Date: Fri, 19 Aug 2016 12:56:56 -0700 From: Eric Dumazet <eric.dumazet@...il.com> To: Thadeu Lima de Souza Cascardo <cascardo@...hat.com> Cc: dev@...nvswitch.org, netdev@...r.kernel.org Subject: Re: [RFC PATCH] openvswitch: use percpu flow stats On Fri, 2016-08-19 at 16:47 -0300, Thadeu Lima de Souza Cascardo wrote: > Instead of using flow stats per NUMA node, use it per CPU. When using > megaflows, the stats lock can be a bottleneck in scalability. ... > > flow_cache = kmem_cache_create("sw_flow", sizeof(struct sw_flow) > - + (nr_node_ids > + + (num_possible_cpus() > * sizeof(struct flow_stats *)), > 0, 0, NULL); > if (flow_cache == NULL) This is bogus. Please use nr_cpu_ids instead of num_possible_cpus().
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