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Date: Fri, 29 Nov 2019 23:13:49 +0100 From: Paweł Staszewski <pstaszewski@...are.pl> To: netdev@...r.kernel.org Subject: Re: Linux kernel - 5.4.0+ (net-next from 27.11.2019) routing/network performance W dniu 29.11.2019 o 23:00, Paweł Staszewski pisze: > As always - each year i need to summarize network performance for > routing applications like linux router on native Linux kernel (without > xdp/dpdk/vpp etc) :) > > HW setup: > > Server (Supermicro SYS-1019P-WTR) > > 1x Intel 6146 > > 2x Mellanox connect-x 5 (100G) (installed in two different x16 pcie > gen3.1 slots) > > 6x 8GB DDR4 2666 (it really matters cause 100G is about 12.5GB/s of > memory bandwidth one direction) > > > And here it is: > > perf top at 72Gbit.s RX and 72Gbit/s TX (at same time) > > PerfTop: 91202 irqs/sec kernel:99.7% exact: 100.0% [4000Hz > cycles:ppp], (all, 24 CPUs) > --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- > > > 7.56% [kernel] [k] __dev_queue_xmit > 5.27% [kernel] [k] build_skb > 4.41% [kernel] [k] rr_transmit > 4.17% [kernel] [k] fib_table_lookup > 3.83% [kernel] [k] mlx5e_skb_from_cqe_mpwrq_linear > 3.30% [kernel] [k] mlx5e_sq_xmit > 3.14% [kernel] [k] __netif_receive_skb_core > 2.48% [kernel] [k] netif_skb_features > 2.36% [kernel] [k] _raw_spin_trylock > 2.27% [kernel] [k] dev_hard_start_xmit > 2.26% [kernel] [k] dev_gro_receive > 2.20% [kernel] [k] mlx5e_handle_rx_cqe_mpwrq > 1.92% [kernel] [k] mlx5_eq_comp_int > 1.91% [kernel] [k] mlx5e_poll_tx_cq > 1.74% [kernel] [k] tcp_gro_receive > 1.68% [kernel] [k] memcpy_erms > 1.64% [kernel] [k] kmem_cache_free_bulk > 1.57% [kernel] [k] inet_gro_receive > 1.55% [kernel] [k] netdev_pick_tx > 1.52% [kernel] [k] ip_forward > 1.45% [kernel] [k] team_xmit > 1.40% [kernel] [k] vlan_do_receive > 1.37% [kernel] [k] team_handle_frame > 1.36% [kernel] [k] __build_skb > 1.33% [kernel] [k] ipt_do_table > 1.33% [kernel] [k] mlx5e_poll_rx_cq > 1.28% [kernel] [k] ip_finish_output2 > 1.26% [kernel] [k] vlan_passthru_hard_header > 1.20% [kernel] [k] netdev_core_pick_tx > 0.93% [kernel] [k] ip_rcv_core.isra.22.constprop.27 > 0.87% [kernel] [k] validate_xmit_skb.isra.148 > 0.87% [kernel] [k] ip_route_input_rcu > 0.78% [kernel] [k] kmem_cache_alloc > 0.77% [kernel] [k] mlx5e_handle_rx_dim > 0.71% [kernel] [k] iommu_need_mapping > 0.69% [kernel] [k] tasklet_action_common.isra.21 > 0.66% [kernel] [k] mlx5e_xmit > 0.65% [kernel] [k] mlx5e_post_rx_mpwqes > 0.63% [kernel] [k] _raw_spin_lock > 0.61% [kernel] [k] ip_sublist_rcv > 0.57% [kernel] [k] skb_release_data > 0.53% [kernel] [k] __local_bh_enable_ip > 0.53% [kernel] [k] tcp4_gro_receive > 0.51% [kernel] [k] pfifo_fast_dequeue > 0.51% [kernel] [k] page_frag_free > 0.50% [kernel] [k] kmem_cache_free > 0.47% [kernel] [k] dma_direct_map_page > 0.45% [kernel] [k] native_irq_return_iret > 0.44% [kernel] [k] __slab_free.isra.89 > 0.43% [kernel] [k] skb_gro_receive > 0.43% [kernel] [k] napi_gro_receive > 0.43% [kernel] [k] __do_softirq > 0.41% [kernel] [k] sch_direct_xmit > 0.41% [kernel] [k] ip_rcv_finish_core.isra.19 > 0.40% [kernel] [k] skb_network_protocol > 0.40% [kernel] [k] __get_xps_queue_idx > > > Im useing team (2x 100G LAG)- that is why here is some load: > > 4.41% [kernel] [k] rr_transmit > > > > No discards on interfaces: > > ethtool -S enp179s0f0 | grep disc > rx_discards_phy: 0 > tx_discards_phy: 0 > > ethtool -S enp179s0f1 | grep disc > rx_discards_phy: 0 > tx_discards_phy: 0 > > io/stream test at 72G/72G traffic: > > ------------------------------------------------------------- > Function Best Rate MB/s Avg time Min time Max time > Copy: 38948.8 0.004368 0.004108 0.004533 > Scale: 37914.6 0.004473 0.004220 0.004802 > Add: 43134.6 0.005801 0.005564 0.006086 > Triad: 42934.1 0.005696 0.005590 0.005901 > ------------------------------------------------------------- > > > And some links to screenshoots > > Softirqs > > https://pasteboard.co/IIZkGrw.png > > And bandwidth / cpu / pps grapsh > > https://pasteboard.co/IIZl6XP.png > > > Currently it looks like the biggest problem for 100G is cpu->mem->nic > bandwidth or nic doorbell / page cache at RX processing - cause what i > can see is that if I run iperf on this host i can TX full 100G - but I > cant RX 100G when i flood this host from some packet generator (it > will start to drop packets at arount 82Gbit/s) - and this is not a > problem with ppp but it is bandwidth problem. > > For example i can flood RX with 14Mpps or 64b packets without nic > discards but i cant flood it with 1000b frames and same pps - cause > when it reaches 82Gbit/s nic's start to report discards. > > > Thanks > > > Forgot to add this is forwarding scenario - so router is routing packets from one 100G interface to another 100G interface and vice-versa (full BGP feed x4 from 4 different upstreams) - 700k+ flows.
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