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Date: Wed, 19 Jun 2024 17:17:59 +0200
From: Sebastiano Miano <mianosebastiano@...il.com>
To: Tariq Toukan <tariqt@...dia.com>
Cc: bpf@...r.kernel.org, netdev@...r.kernel.org, saeedm@...dia.com,
hawk@...nel.org, edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
Gal Pressman <gal@...dia.com>, amira@...dia.com
Subject: Re: XDP Performance Regression in recent kernel versions
On Wed, 19 Jun 2024 at 08:00, Tariq Toukan <tariqt@...dia.com> wrote:
>
> Thanks for your report.
>
> I assume cpu util for the active core on the DUT is 100% in all cases,
> right?
Yes, that's correct.
The irq is also on the core on the right numa node, and I have
disabled CPU frequency scaling.
>
> Can you please share some more details? Like relevant ethtool counters,
> and perf top output.
>
> We'll check if this repro for us as well.
Sure, below you can find the reports for the XDP_DROP and XDP_TX cases.
I am attaching only the ones for kern v5.15 vs v6.5.
--------------------------------------------------
ethtool output (5.15) - Missing counters are zero
--------------------------------------------------
NIC statistics:
rx_packets: 333854100
rx_bytes: 20031246044
tx_packets: 25
tx_bytes: 2070
rx_csum_unnecessary: 333854079
rx_xdp_drop: 3753342954
rx_xdp_redirect: 0
rx_xdp_tx_xmit: 5582660674
rx_xdp_tx_mpwqe: 175018775
rx_xdp_tx_inlnw: 8970048
rx_xdp_tx_nops: 378338337
rx_xdp_tx_full: 0
rx_xdp_tx_err: 0
rx_xdp_tx_cqe: 87229072
rx_cache_reuse: 9369255040
rx_cache_full: 68
rx_cache_empty: 16153471
rx_cache_busy: 193
rx_cache_waive: 15864256
rx_congst_umr: 158
ch_events: 448
ch_poll: 151091830
ch_arm: 301
rx_out_of_buffer: 990473555
rx_if_down_packets: 67469721
rx_steer_missed_packets: 1962570491
rx_vport_unicast_packets: 38460159194
rx_vport_unicast_bytes: 2461450188460
tx_vport_unicast_packets: 5582654212
tx_vport_unicast_bytes: 334959252764
tx_packets_phy: 5588396729
rx_packets_phy: 97052087562
tx_bytes_phy: 357657403514
rx_bytes_phy: 6211329423080
tx_mac_control_phy: 5745055
tx_pause_ctrl_phy: 5745055
rx_discards_phy: 58591428329
tx_discards_phy: 0
tx_errors_phy: 0
rx_undersize_pkts_phy: 0
rx_fragments_phy: 0
rx_jabbers_phy: 0
rx_64_bytes_phy: 97052040472
rx_65_to_127_bytes_phy: 3
rx_128_to_255_bytes_phy: 0
rx_256_to_511_bytes_phy: 26
rx_512_to_1023_bytes_phy: 0
rx_1024_to_1518_bytes_phy: 0
rx_1519_to_2047_bytes_phy: 0
rx_2048_to_4095_bytes_phy: 0
rx_4096_to_8191_bytes_phy: 0
rx_8192_to_10239_bytes_phy: 0
rx_prio0_bytes: 6211318150440
rx_prio0_packets: 38460533605
rx_prio0_discards: 58591314012
tx_prio0_bytes: 357288052986
tx_prio0_packets: 5582625883
tx_global_pause: 5745042
tx_global_pause_duration: 771103810
ch0_events: 55
ch0_poll: 146981606
ch0_arm: 35
ch0_aff_change: 6
ch0_force_irq: 0
ch0_eq_rearm: 0
rx0_packets: 70812690
rx0_bytes: 4248761400
rx0_csum_complete: 0
rx0_csum_complete_tail: 0
rx0_csum_complete_tail_slow: 0
rx0_csum_unnecessary: 70812671
rx0_csum_unnecessary_inner: 0
rx0_csum_none: 19
rx0_xdp_drop: 3753342954
rx0_xdp_redirect: 0
rx0_lro_packets: 0
rx0_lro_bytes: 0
rx0_ecn_mark: 0
rx0_removed_vlan_packets: 0
rx0_wqe_err: 0
rx0_mpwqe_filler_cqes: 0
rx0_mpwqe_filler_strides: 0
rx0_oversize_pkts_sw_drop: 0
rx0_buff_alloc_err: 0
rx0_cqe_compress_blks: 0
rx0_cqe_compress_pkts: 0
rx0_cache_reuse: 9368316609
rx0_cache_full: 2
rx0_cache_empty: 11519
rx0_cache_busy: 0
rx0_cache_waive: 0
rx0_congst_umr: 158
rx0_arfs_err: 0
rx0_recover: 0
rx0_xdp_tx_xmit: 5582664928
rx0_xdp_tx_mpwqe: 175018908
rx0_xdp_tx_inlnw: 8970048
rx0_xdp_tx_nops: 378338623
rx0_xdp_tx_full: 0
rx0_xdp_tx_err: 0
rx0_xdp_tx_cqes: 87229139
--------------------------------------------------
perf top output (5.15) - XDP_DROP
--------------------------------------------------
19.27% [kernel] [k] mlx5e_skb_from_cqe_mpwrq_linear
11.74% [kernel] [k] mlx5e_handle_rx_cqe_mpwrq
9.82% [kernel] [k] mlx5e_xdp_handle
9.43% [kernel] [k] mlx5e_alloc_rx_mpwqe
9.29% bpf_prog_xdp_basic_prog [k] bpf_prog_5f76c01f0ff23233_xdp_basic_prog
7.06% [kernel] [k] mlx5e_page_release_dynamic
6.95% [kernel] [k] mlx5e_poll_rx_cq
5.89% [kernel] [k] dma_sync_single_for_cpu
5.21% [kernel] [k] dma_sync_single_for_device
4.12% [kernel] [k] mlx5e_free_rx_mpwqe
1.65% [kernel] [k] mlx5e_poll_ico_cq
1.60% [kernel] [k] mlx5e_napi_poll
1.59% [kernel] [k] bpf_get_smp_processor_id
0.94% [kernel] [k] bpf_dispatcher_xdp_func
0.91% [kernel] [k] net_rx_action
0.90% bpf_prog_xdp_dispatcher [k] bpf_prog_17d608957d1f805a_xdp_dispatcher
0.90% [kernel] [k] bpf_dispatcher_xdp
0.64% [kernel] [k] mlx5e_post_rx_mpwqes
0.64% [kernel] [k] mlx5e_poll_xdpsq_cq
0.37% [kernel] [k] __softirqentry_text_start
--------------------------------------------------
perf top output (5.15) - XDP_TX
--------------------------------------------------
13.84% bpf_prog_xdp_swap_macs_prog [k]
bpf_prog_0a3ad412f28cbb6d_xdp_swap_macs_prog
11.43% [kernel] [k] mlx5e_xmit_xdp_buff
10.69% [kernel] [k] mlx5e_skb_from_cqe_mpwrq_linear
9.79% [kernel] [k] mlx5e_xmit_xdp_frame_mpwqe
8.35% [kernel] [k] mlx5e_handle_rx_cqe_mpwrq
6.34% [kernel] [k] dma_sync_single_for_device
6.20% [kernel] [k] mlx5e_poll_rx_cq
5.62% [kernel] [k] mlx5e_page_release_dynamic
5.33% [kernel] [k] mlx5e_xdp_handle
5.21% [kernel] [k] mlx5e_alloc_rx_mpwqe
4.47% [kernel] [k] mlx5e_free_xdpsq_desc
3.26% [kernel] [k] dma_sync_single_for_cpu
1.47% [kernel] [k] mlx5e_xmit_xdp_frame_check_mpwqe
1.22% [kernel] [k] mlx5e_poll_xdpsq_cq
0.95% [kernel] [k] net_rx_action
0.90% [kernel] [k] bpf_get_smp_processor_id
0.80% [kernel] [k] mlx5e_napi_poll
0.69% [kernel] [k] mlx5e_xdp_mpwqe_session_start
0.63% [kernel] [k] mlx5e_poll_ico_cq
0.49% [kernel] [k] bpf_dispatcher_xdp
0.47% [kernel] [k] bpf_dispatcher_xdp_func
---------------------------------------------------------------------------------------
--------------------------------------------------
ethtool output (6.5) - Missing counters are zero
--------------------------------------------------
NIC statistics:
rx_packets: 7282880
rx_bytes: 436973482
tx_packets: 42
tx_bytes: 3556
rx_csum_unnecessary: 7282816
rx_xdp_drop: 7783331724
rx_xdp_redirect: 0
rx_xdp_tx_xmit: 46956452544
rx_xdp_tx_mpwqe: 4401807536
rx_xdp_tx_inlnw: 46951234092
rx_xdp_tx_nops: 4988835176
rx_xdp_tx_full: 0
rx_xdp_tx_err: 0
rx_xdp_tx_cqe: 733694572
rx_pp_alloc_fast: 3641784
rx_pp_alloc_slow: 8
rx_pp_alloc_slow_high_order: 0
rx_pp_alloc_empty: 8
rx_pp_alloc_refill: 0
rx_pp_alloc_waive: 0
rx_pp_recycle_cached: 3641280
ch_events: 505
ch_poll: 855423286
rx_out_of_buffer: 534918379
rx_if_down_packets: 4044804
rx_steer_missed_packets: 298
rx_vport_unicast_packets: 287214261626
rx_vport_unicast_bytes: 18381712744116
tx_vport_unicast_packets: 46956452544
tx_vport_unicast_bytes: 2817387157674
tx_packets_phy: 47000866603
rx_packets_phy: 728277471186
tx_bytes_phy: 3008055468662
rx_bytes_phy: 46609758231313
tx_mac_control_phy: 44414017
tx_pause_ctrl_phy: 44414017
rx_discards_phy: 441063206498
rx_64_bytes_phy: 728277470842
rx_65_to_127_bytes_phy: 133
rx_128_to_255_bytes_phy: 0
rx_256_to_511_bytes_phy: 211
rx_512_to_1023_bytes_phy: 0
rx_1024_to_1518_bytes_phy: 0
rx_1519_to_2047_bytes_phy: 0
rx_2048_to_4095_bytes_phy: 0
rx_4096_to_8191_bytes_phy: 0
rx_8192_to_10239_bytes_phy: 0
rx_buffer_passed_thres_phy: 1192226
rx_prio0_bytes: 46609758231313
rx_prio0_packets: 287214264688
rx_prio0_discards: 441063206498
tx_prio0_bytes: 3005212971574
tx_prio0_packets: 46956452586
tx_global_pause: 44414017
tx_global_pause_duration: 5961284324
ch0_events: 120
ch0_poll: 855423025
ch0_arm: 100
ch0_aff_change: 0
ch0_force_irq: 0
ch0_eq_rearm: 0
rx0_packets: 7282880
rx0_bytes: 436973482
rx0_csum_complete: 0
rx0_csum_complete_tail: 0
rx0_csum_complete_tail_slow: 0
rx0_csum_unnecessary: 7282816
rx0_csum_unnecessary_inner: 0
rx0_csum_none: 64
rx0_xdp_drop: 7783331724
rx0_xdp_redirect: 0
rx0_lro_packets: 0
rx0_lro_bytes: 0
rx0_gro_packets: 0
rx0_gro_bytes: 0
rx0_gro_skbs: 0
rx0_gro_match_packets: 0
rx0_gro_large_hds: 0
rx0_ecn_mark: 0
rx0_removed_vlan_packets: 0
rx0_wqe_err: 0
rx0_mpwqe_filler_cqes: 0
rx0_mpwqe_filler_strides: 0
rx0_oversize_pkts_sw_drop: 0
rx0_buff_alloc_err: 0
rx0_cqe_compress_blks: 0
rx0_cqe_compress_pkts: 0
rx0_congst_umr: 0
rx0_arfs_err: 0
rx0_recover: 0
rx0_pp_alloc_fast: 3641784
rx0_pp_alloc_slow: 8
rx0_pp_alloc_slow_high_order: 0
rx0_pp_alloc_empty: 8
rx0_pp_alloc_refill: 0
rx0_pp_alloc_waive: 0
rx0_pp_recycle_cached: 3641280
rx0_pp_recycle_cache_full: 0
rx0_pp_recycle_ring: 0
rx0_pp_recycle_ring_full: 0
rx0_pp_recycle_released_ref: 0
rx0_xdp_tx_xmit: 46956452544
rx0_xdp_tx_mpwqe: 4401807536
rx0_xdp_tx_inlnw: 46951234092
rx0_xdp_tx_nops: 4988835176
rx0_xdp_tx_full: 0
rx0_xdp_tx_err: 0
rx0_xdp_tx_cqes: 733694572
--------------------------------------------------
perf top output (6.5) - XDP_DROP
--------------------------------------------------
27.63% [kernel] [k] mlx5e_skb_from_cqe_mpwrq_linear
12.61% [kernel] [k] mlx5e_handle_rx_cqe_mpwrq
8.38% [kernel] [k] mlx5e_rx_cq_process_basic_cqe_comp
7.06% [kernel] [k] page_pool_put_defragged_page
6.45% [kernel] [k] mlx5e_xdp_handle
5.36% bpf_prog_xdp_basic_prog [k] bpf_prog_5f76c01f0ff23233_xdp_basic_prog
4.95% [kernel] [k] dma_sync_single_for_device
4.89% [kernel] [k] page_pool_alloc_pages
4.36% [kernel] [k] mlx5e_alloc_rx_mpwqe
3.70% [kernel] [k] dma_sync_single_for_cpu
2.71% [kernel] [k] mlx5e_page_release_fragmented.isra.0
2.09% [kernel] [k] bpf_dispatcher_xdp_func
1.95% [kernel] [k] mlx5e_free_rx_mpwqe
1.10% [kernel] [k] mlx5e_poll_ico_cq
1.07% [kernel] [k] bpf_get_smp_processor_id
1.05% [kernel] [k] mlx5e_napi_poll
0.85% [kernel] [k] mlx5e_poll_xdpsq_cq
0.61% [kernel] [k] net_rx_action
0.58% bpf_prog_xdp_dispatcher [k] bpf_prog_17d608957d1f805a_xdp_dispatcher
0.57% [kernel] [k] bpf_dispatcher_xdp
0.53% [kernel] [k] mlx5e_post_rx_mpwqes
0.27% [kernel] [k] __do_softirq
0.25% [kernel] [k] mlx5e_poll_tx_cq
--------------------------------------------------
perf top output (6.5) - XDP_TX
--------------------------------------------------
19.60% [kernel] [k] mlx5e_xdp_mpwqe_add_dseg
14.61% [kernel] [k] mlx5e_skb_from_cqe_mpwrq_linear
11.55% [kernel] [k] mlx5e_xmit_xdp_buff
5.85% [kernel] [k] mlx5e_handle_rx_cqe_mpwrq
5.73% bpf_prog_xdp_swap_macs_prog [k] bpf_prog_0a3a_xdp_swap_macs_prog
5.09% [kernel] [k] mlx5e_free_xdpsq_desc
5.08% [kernel] [k] dma_sync_single_for_device
4.66% [kernel] [k] mlx5e_xmit_xdp_frame_mpwqe
3.64% [kernel] [k] mlx5e_rx_cq_process_basic_cqe_comp
3.34% [kernel] [k] page_pool_put_defragged_page
3.04% [kernel] [k] mlx5e_xdp_handle
3.03% [kernel] [k] mlx5e_page_release_fragmented.isra.0
2.56% [kernel] [k] dma_sync_single_for_cpu
2.15% [kernel] [k] mlx5e_alloc_rx_mpwqe
1.96% [kernel] [k] page_pool_alloc_pages
1.06% [kernel] [k] mlx5e_xmit_xdp_frame_check_mpwqe
1.02% [kernel] [k] bpf_dispatcher_xdp_func
1.01% [kernel] [k] mlx5e_free_rx_mpwqe
0.84% [kernel] [k] mlx5e_poll_xdpsq_cq
0.62% [kernel] [k] mlx5e_xdpsq_get_next_pi
0.53% [kernel] [k] mlx5e_poll_ico_cq
0.48% [kernel] [k] bpf_get_smp_processor_id
0.48% [kernel] [k] net_rx_action
0.36% [kernel] [k] mlx5e_napi_poll
0.32% [kernel] [k] mlx5e_xdp_mpwqe_complete
0.25% [kernel] [k] bpf_dispatcher_xdp
0.22% bpf_prog_xdp_dispatcher [k] bpf_prog_17d6_xdp_dispatcher
0.21% [kernel] [k] mlx5e_post_rx_mpwqes
0.11% [kernel] [k] __do_softirq
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