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Date: Sun, 28 Jan 2018 19:26:02 +0100 From: Paweł Staszewski <pstaszewski@...are.pl> To: "netde >> Linux Kernel Network Developers" <netdev@...r.kernel.org> Subject: Re: kernel 4.15.0-rc9+ (net-next) high cpu load at 50Gbit/s - about 6Mpps W dniu 27.01.2018 o 23:23, Paweł Staszewski pisze: > Hi > > > Today I made some real life traffic tests with kernel 4.15.0-rc9 > > but when traffic reach 50Gbit/s and about 6Mpps cpou load rises fast > from 48% to 100% for all cpu cores. > > Here is some graph that presenting how cpu load rises when there was > more pps. > > > https://ibb.co/mhD5ob > > > here is perf record from that time: > > https://pastebin.com/3zqG1rvE > > > There is 8x 10G ixgbe 82599 interfaces teamed with teamd. > > No traffic queueing - only pfifo fast on all interfaces. > > No NAT or iptables forles other than INPUT (about 30rules) > > All nic's have same ethtool settings: > > ethtool -k eth0 > Features for eth0: > Cannot get device udp-fragmentation-offload settings: Operation not > supported > rx-checksumming: on > tx-checksumming: on > tx-checksum-ipv4: off [fixed] > tx-checksum-ip-generic: on > tx-checksum-ipv6: off [fixed] > tx-checksum-fcoe-crc: off [fixed] > tx-checksum-sctp: on > scatter-gather: on > tx-scatter-gather: on > tx-scatter-gather-fraglist: off [fixed] > tcp-segmentation-offload: on > tx-tcp-segmentation: on > tx-tcp-ecn-segmentation: off [fixed] > tx-tcp-mangleid-segmentation: off > tx-tcp6-segmentation: on > udp-fragmentation-offload: off > generic-segmentation-offload: on > generic-receive-offload: on > large-receive-offload: off > rx-vlan-offload: on > tx-vlan-offload: on > ntuple-filters: on > receive-hashing: on > highdma: on [fixed] > rx-vlan-filter: on > vlan-challenged: off [fixed] > tx-lockless: off [fixed] > netns-local: off [fixed] > tx-gso-robust: off [fixed] > tx-fcoe-segmentation: off [fixed] > tx-gre-segmentation: on > tx-gre-csum-segmentation: on > tx-ipxip4-segmentation: on > tx-ipxip6-segmentation: on > tx-udp_tnl-segmentation: on > tx-udp_tnl-csum-segmentation: on > tx-gso-partial: on > tx-sctp-segmentation: off [fixed] > tx-esp-segmentation: off [fixed] > fcoe-mtu: off [fixed] > tx-nocache-copy: off > loopback: off [fixed] > rx-fcs: off [fixed] > rx-all: off > tx-vlan-stag-hw-insert: off [fixed] > rx-vlan-stag-hw-parse: off [fixed] > rx-vlan-stag-filter: off [fixed] > l2-fwd-offload: off > hw-tc-offload: off > esp-hw-offload: off [fixed] > esp-tx-csum-hw-offload: off [fixed] > rx-udp_tunnel-port-offload: on > > > ethtool -g eth0 > Ring parameters for eth0: > Pre-set maximums: > RX: 4096 > RX Mini: 0 > RX Jumbo: 0 > TX: 4096 > Current hardware settings: > RX: 4096 > RX Mini: 0 > RX Jumbo: 0 > TX: 2048 > > > ethtool -c eth0 > Coalesce parameters for eth0: > Adaptive RX: off TX: off > stats-block-usecs: 0 > sample-interval: 0 > pkt-rate-low: 0 > pkt-rate-high: 0 > > rx-usecs: 512 > rx-frames: 0 > rx-usecs-irq: 0 > rx-frames-irq: 0 > > tx-usecs: 0 > tx-frames: 0 > tx-usecs-irq: 0 > tx-frames-irq: 0 > > rx-usecs-low: 0 > rx-frame-low: 0 > tx-usecs-low: 0 > tx-frame-low: 0 > > rx-usecs-high: 0 > rx-frame-high: 0 > tx-usecs-high: 0 > tx-frame-high: 0 > > > > Peft top for kernel 4.15.0-rc9 below (all 40 cores 100% cpu load with 6.3Mpps) 20.96% [kernel] [k] queued_spin_lock_slowpath 5.51% [kernel] [k] ixgbe_poll 5.49% [kernel] [k] ixgbe_xmit_frame_ring 4.39% [kernel] [k] do_raw_spin_lock 4.29% [kernel] [k] sch_direct_xmit 4.11% [kernel] [k] fib_table_lookup 3.11% [team_mode_roundrobin] [k] rr_transmit 2.71% [kernel] [k] __dev_queue_xmit 2.62% [kernel] [k] __ptr_ring_peek 2.39% [kernel] [k] skb_release_data 2.18% [kernel] [k] dev_gro_receive 1.75% [kernel] [k] __qdisc_run 1.67% [kernel] [k] pfifo_fast_enqueue 1.57% [kernel] [k] netdev_pick_tx 1.56% [kernel] [k] page_frag_free 1.48% [kernel] [k] ip_finish_output2 1.38% [kernel] [k] __slab_free 1.36% [kernel] [k] skb_unref 1.34% [kernel] [k] ixgbe_maybe_stop_tx 1.30% [kernel] [k] vlan_do_receive 1.28% [kernel] [k] pfifo_fast_dequeue 1.23% [kernel] [k] virt_to_head_page Same configuration kernel 4.15.0-rc3 (50% cpu load on all 40 cores with 6.3Mpps) 7.81% [kernel] [k] ixgbe_xmit_frame_ring 7.61% [kernel] [k] ixgbe_poll 7.09% [kernel] [k] do_raw_spin_lock 5.63% [kernel] [k] fib_table_lookup 5.19% [kernel] [k] __dev_queue_xmit 4.38% [team_mode_roundrobin] [k] rr_transmit 3.10% [kernel] [k] netdev_pick_tx 2.79% [kernel] [k] skb_release_data 2.34% [kernel] [k] dev_gro_receive 1.99% [kernel] [k] page_frag_free 1.96% [kernel] [k] skb_unref 1.92% [kernel] [k] virt_to_head_page 1.90% [kernel] [k] ixgbe_maybe_stop_tx 1.82% [kernel] [k] vlan_do_receive 1.74% [kernel] [k] ip_finish_output2 1.73% [kernel] [k] __build_skb 1.68% [kernel] [k] __slab_free 1.67% [kernel] [k] __netif_receive_skb_core 1.60% [kernel] [k] inet_gro_receive 1.49% [kernel] [k] netif_skb_features 1.35% [kernel] [k] ip_rcv 1.33% [kernel] [k] ipt_do_table 1.30% [kernel] [k] compound_head 1.26% [kernel] [k] dev_hard_start_xmit 1.18% [kernel] [k] put_page 1.13% [kernel] [k] tcp_gro_receive 1.13% [kernel] [k] ip_forward 0.99% [kernel] [k] validate_xmit_skb 0.97% [kernel] [k] ip_route_input_rcu 0.88% [kernel] [k] inet_lookup_ifaddr_rcu 0.81% [kernel] [k] pfifo_fast_dequeue 0.77% [kernel] [k] vlan_dev_hard_start_xmit 0.64% [kernel] [k] ___slab_alloc
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