From: Paolo Abeni Date: Thu, 30 Mar 2023 11:40:04 +0000 (+0200) Subject: Merge branch 'net-rps-rfs-improvements' X-Git-Tag: v6.4-rc1~77^2~192 X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=4ddd6375c3ef6756d492ea5466408cace097121b;p=tomoyo%2Ftomoyo-test1.git Merge branch 'net-rps-rfs-improvements' Eric Dumazet says: ==================== net: rps/rfs improvements Jason Xing attempted to optimize napi_schedule_rps() by avoiding unneeded NET_RX_SOFTIRQ raises: [1], [2] This is quite complex to implement properly. I chose to implement the idea, and added a similar optimization in ____napi_schedule() Overall, in an intensive RPC workload, with 32 TX/RX queues with RFS I was able to observe a ~10% reduction of NET_RX_SOFTIRQ invocations. While this had no impact on throughput or cpu costs on this synthetic benchmark, we know that firing NET_RX_SOFTIRQ from softirq handler can force __do_softirq() to wakeup ksoftirqd when need_resched() is true. This can have a latency impact on stressed hosts. [1] https://lore.kernel.org/lkml/20230325152417.5403-1-kerneljasonxing@gmail.com/ [2] https://lore.kernel.org/netdev/20230328142112.12493-1-kerneljasonxing@gmail.com/ ==================== Link: https://lore.kernel.org/r/20230328235021.1048163-1-edumazet@google.com Signed-off-by: Paolo Abeni --- 4ddd6375c3ef6756d492ea5466408cace097121b