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Date: Fri, 28 Jan 2022 14:27:28 -0800 From: Jakub Kicinski <kuba@...nel.org> To: Íñigo Huguet <ihuguet@...hat.com> Cc: ecree.xilinx@...il.com, habetsm.xilinx@...il.com, davem@...emloft.net, netdev@...r.kernel.org Subject: Re: [PATCH net-next 1/2] sfc: default config to 1 channel/core in local NUMA node only On Fri, 28 Jan 2022 16:19:21 +0100 Íñigo Huguet wrote: > Handling channels from CPUs in different NUMA node can penalize > performance, so better configure only one channel per core in the same > NUMA node than the NIC, and not per each core in the system. > > Fallback to all other online cores if there are not online CPUs in local > NUMA node. I think we should make netif_get_num_default_rss_queues() do a similar thing. Instead of min(8, num_online_cpus()) we should default to num_cores / 2 (that's physical cores, not threads). From what I've seen this appears to strike a good balance between wasting resources on pointless queues per hyperthread, and scaling up for CPUs which have many wimpy cores.
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