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Date: Sun, 27 Aug 2023 17:20:10 +0300
From: Martin Zaharinov <micron10@...il.com>
To: netdev <netdev@...r.kernel.org>,
Eric Dumazet <edumazet@...gle.com>
Subject: High Cpu load when run smartdns : __ipv6_dev_get_saddr
Hi Eric
i need you help to find is this bug or no.
I talk with smartdns team and try to research in his code but for the moment not found ..
test system have 5k ppp users on pppoe device
after run smartdns
service got to 100% load
in normal case when run other 2 type of dns server (isc bind or knot ) all is fine .
but when run smartdns see perf :
PerfTop: 4223 irqs/sec kernel:96.9% exact: 100.0% lost: 0/0 drop: 0/0 [4000Hz cycles], (target_pid: 1208268)
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
28.48% [kernel] [k] __ipv6_dev_get_saddr
12.31% [kernel] [k] l3mdev_master_ifindex_rcu
6.63% [pppoe] [k] pppoe_rcv
3.82% [kernel] [k] ipv6_dev_get_saddr
2.07% [kernel] [k] __dev_queue_xmit
1.46% [ixgbe] [k] ixgbe_clean_rx_irq
1.42% [kernel] [k] memcmp
1.37% [nf_tables] [k] nft_do_chain
1.35% [nf_tables] [k] __nft_rbtree_lookup
1.29% [kernel] [k] __netif_receive_skb_core.constprop.0
1.01% [kernel] [k] strncpy
0.93% [kernel] [k] fib_table_lookup
0.91% [kernel] [k] dev_queue_xmit_nit
0.89% [kernel] [k] csum_partial_copy_generic
0.89% [kernel] [k] skb_clone
0.86% [kernel] [k] __skb_flow_dissect
0.83% [kernel] [k] __copy_skb_header
0.80% [kernel] [k] kmem_cache_free
0.73% [nf_tables] [k] nft_rhash_lookup
0.70% [nf_conntrack] [k] __nf_conntrack_find_get.isra.0
0.70% [kernel] [k] skb_release_data
0.64% [ixgbe] [k] ixgbe_tx_map
0.53% [kernel] [k] kmem_cache_alloc
0.51% [kernel] [k] kfree_skb_reason
0.48% [kernel] [k] ip_route_input_slow
0.48% [kernel] [k] dev_hard_start_xmit
0.48% [kernel] [k] ip_finish_output2
0.47% [vlan_mon] [k] vlan_pt_recv
0.42% [kernel] [k] nf_hook_slow
0.40% [kernel] [k] __siphash_unaligned
0.39% [kernel] [k] ___slab_alloc.isra.0
0.38% [nf_tables] [k] nft_lookup_eval
0.38% [ixgbe] [k] ixgbe_xmit_frame_ring
0.36% [kernel] [k] netif_skb_features
0.33% [kernel] [k] dev_gro_receive
0.33% [kernel] [k] ip_rcv_core.constprop.0
0.32% [kernel] [k] vlan_do_receive
0.30% [kernel] [k] ip_forward
0.30% [kernel] [k] get_rps_cpu
0.30% [kernel] [k] process_backlog
0.30% [kernel] [k] ktime_get_with_offset
0.30% [kernel] [k] _raw_spin_lock_irqsave
0.30% [kernel] [k] validate_xmit_skb.isra.0
0.30% [kernel] [k] __rcu_read_unlock
0.30% [kernel] [k] sch_direct_xmit
0.29% [kernel] [k] page_frag_free
0.29% [nf_conntrack] [k] nf_conntrack_in
0.28% [kernel] [k] netdev_core_pick_tx
0.28% [nf_tables] [k] nft_meta_get_eval
0.27% [kernel] [k] kmem_cache_free_bulk.part.0
0.26% [kernel] [k] ip_output
0.26% [kernel] [k] _raw_spin_lock_bh
0.26% [kernel] [k] __local_bh_enable_ip
0.25% [kernel] [k] netdev_pick_tx
0.23% [ppp_generic] [k] __ppp_xmit_process
0.23% [nf_nat] [k] l4proto_manip_pkt
0.23% [ixgbe] [k] ixgbe_process_skb_fields
0.23% [pppoe] [k] pppoe_xmit
0.23% [kernel] [k] skb_network_protocol
0.22% [kernel] [k] inet_gro_receive
0.22% [ppp_generic] [k] ppp_start_xmit
0.22% [kernel] [k] __list_del_entry_valid
0.20% [kernel] [k] __slab_free.isra.0
0.20% [kernel] [k] _raw_spin_lock
0.20% [kernel] [k] __rcu_read_lock
0.20% [kernel] [k] csum_partial
0.20% [kernel] [k] read_tsc
0.19% [nf_nat] [k] nf_nat_ipv4_manip_pkt
0.18% [kernel] [k] napi_build_skb
0.18% [ixgbe] [k] ixgbe_clean_tx_irq
0.18% [kernel] [k] dma_map_page_attrs
0.17% [ppp_generic] [k] ppp_push
0.16% [kernel] [k] vlan_dev_hard_start_xmit
0.15% [kernel] [k] skb_segment
0.14% [kernel] [k] napi_consume_skb
0.14% [kernel] [k] enqueue_to_backlog
0.13% [kernel] [k] kmem_cache_alloc_bulk
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