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Date: Fri, 9 Nov 2018 23:20:38 +0100
From: Paweł Staszewski <pstaszewski@...are.pl>
To: Saeed Mahameed <saeedm@...lanox.com>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
Jesper Dangaard Brouer <brouer@...hat.com>
Subject: Re: Kernel 4.19 network performance - forwarding/routing normal users
traffic
W dniu 08.11.2018 o 20:12, Paweł Staszewski pisze:
> CPU load is lower than for connectx4 - but it looks like bandwidth
> limit is the same :)
> But also after reaching 60Gbit/60Gbit
>
> bwm-ng v0.6.1 (probing every 1.000s), press 'h' for help
> input: /proc/net/dev type: rate
> - iface Rx Tx Total
> ==============================================================================
>
> enp175s0: 45.09 Gb/s 15.09 Gb/s
> 60.18 Gb/s
> enp216s0: 15.14 Gb/s 45.19 Gb/s
> 60.33 Gb/s
> ------------------------------------------------------------------------------
>
> total: 60.45 Gb/s 60.48 Gb/s 120.93 Gb/s
Today reached 65/65Gbit/s
But starting from 60Gbit/s RX / 60Gbit TX nics start to drop packets
(with 50%CPU on all 28cores) - so still there is cpu power to use :).
So checked other stats.
softnet_stats shows average 1k squeezed per sec:
cpu total dropped squeezed collision rps flow_limit
0 18554 0 1 0 0 0
1 16728 0 1 0 0 0
2 18033 0 1 0 0 0
3 17757 0 1 0 0 0
4 18861 0 0 0 0 0
5 0 0 1 0 0 0
6 2 0 1 0 0 0
7 0 0 1 0 0 0
8 0 0 0 0 0 0
9 0 0 1 0 0 0
10 0 0 0 0 0 0
11 0 0 1 0 0 0
12 50 0 1 0 0 0
13 257 0 0 0 0 0
14 3629115363 0 3353259 0 0 0
15 255167835 0 3138271 0 0 0
16 4240101961 0 3036130 0 0 0
17 599810018 0 3072169 0 0 0
18 432796524 0 3034191 0 0 0
19 41803906 0 3037405 0 0 0
20 900382666 0 3112294 0 0 0
21 620926085 0 3086009 0 0 0
22 41861198 0 3023142 0 0 0
23 4090425574 0 2990412 0 0 0
24 4264870218 0 3010272 0 0 0
25 141401811 0 3027153 0 0 0
26 104155188 0 3051251 0 0 0
27 4261258691 0 3039765 0 0 0
28 4 0 1 0 0 0
29 4 0 0 0 0 0
30 0 0 1 0 0 0
31 0 0 0 0 0 0
32 3 0 1 0 0 0
33 1 0 1 0 0 0
34 0 0 1 0 0 0
35 0 0 0 0 0 0
36 0 0 1 0 0 0
37 0 0 1 0 0 0
38 0 0 1 0 0 0
39 0 0 1 0 0 0
40 0 0 0 0 0 0
41 0 0 1 0 0 0
42 299758202 0 3139693 0 0 0
43 4254727979 0 3103577 0 0 0
44 1959555543 0 2554885 0 0 0
45 1675702723 0 2513481 0 0 0
46 1908435503 0 2519698 0 0 0
47 1877799710 0 2537768 0 0 0
48 2384274076 0 2584673 0 0 0
49 2598104878 0 2593616 0 0 0
50 1897566829 0 2530857 0 0 0
51 1712741629 0 2489089 0 0 0
52 1704033648 0 2495892 0 0 0
53 1636781820 0 2499783 0 0 0
54 1861997734 0 2541060 0 0 0
55 2113521616 0 2555673 0 0 0
So i rised netdev backlog and budged to rly high values
524288 for netdev_budget and same for backlog
This rised sortirqs from about 600k/sec to 800k/sec for NET_TX/NET_RX
But after this changes i have less packets drops.
Below perf top from max traffic reached:
PerfTop: 72230 irqs/sec kernel:99.4% exact: 0.0% [4000Hz
cycles], (all, 56 CPUs)
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
12.62% [kernel] [k] mlx5e_skb_from_cqe_mpwrq_linear
8.44% [kernel] [k] mlx5e_sq_xmit
6.69% [kernel] [k] build_skb
5.21% [kernel] [k] fib_table_lookup
3.54% [kernel] [k] memcpy_erms
3.20% [kernel] [k] mlx5e_poll_rx_cq
2.25% [kernel] [k] vlan_do_receive
2.20% [kernel] [k] mlx5e_post_rx_mpwqes
2.02% [kernel] [k] mlx5e_handle_rx_cqe_mpwrq
1.95% [kernel] [k] __dev_queue_xmit
1.83% [kernel] [k] dev_gro_receive
1.79% [kernel] [k] tcp_gro_receive
1.73% [kernel] [k] ip_finish_output2
1.63% [kernel] [k] mlx5e_poll_tx_cq
1.49% [kernel] [k] ipt_do_table
1.38% [kernel] [k] inet_gro_receive
1.31% [kernel] [k] __netif_receive_skb_core
1.30% [kernel] [k] _raw_spin_lock
1.28% [kernel] [k] mlx5_eq_int
1.24% [kernel] [k] irq_entries_start
1.19% [kernel] [k] __build_skb
1.15% [kernel] [k] swiotlb_map_page
1.02% [kernel] [k] vlan_dev_hard_start_xmit
0.94% [kernel] [k] pfifo_fast_dequeue
0.92% [kernel] [k] ip_route_input_rcu
0.86% [kernel] [k] kmem_cache_alloc
0.80% [kernel] [k] mlx5e_xmit
0.79% [kernel] [k] dev_hard_start_xmit
0.78% [kernel] [k] _raw_spin_lock_irqsave
0.74% [kernel] [k] ip_forward
0.72% [kernel] [k] tasklet_action_common.isra.21
0.68% [kernel] [k] pfifo_fast_enqueue
0.67% [kernel] [k] netif_skb_features
0.66% [kernel] [k] skb_segment
0.60% [kernel] [k] skb_gro_receive
0.56% [kernel] [k] validate_xmit_skb.isra.142
0.53% [kernel] [k] skb_release_data
0.51% [kernel] [k] mlx5e_page_release
0.51% [kernel] [k] ip_rcv_core.isra.20.constprop.25
0.51% [kernel] [k] __qdisc_run
0.50% [kernel] [k] tcp4_gro_receive
0.49% [kernel] [k] page_frag_free
0.46% [kernel] [k] kmem_cache_free_bulk
0.43% [kernel] [k] kmem_cache_free
0.42% [kernel] [k] try_to_wake_up
0.39% [kernel] [k] _raw_spin_lock_irq
0.39% [kernel] [k] find_busiest_group
0.37% [kernel] [k] __memcpy
Remember those tests are now on two separate connectx5 connected to two
separate pcie x16 gen 3.0
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