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Date: Tue, 15 Aug 2017 11:19:06 +0200
From: Paweł Staszewski <pstaszewski@...are.pl>
To: Eric Dumazet <eric.dumazet@...il.com>
Cc: Paolo Abeni <pabeni@...hat.com>,
Jesper Dangaard Brouer <brouer@...hat.com>,
Linux Kernel Network Developers <netdev@...r.kernel.org>,
Alexander Duyck <alexander.duyck@...il.com>
Subject: Re: Kernel 4.13.0-rc4-next-20170811 - IP Routing / Forwarding
performance vs Core/RSS number / HT on
With hack:
14.44% [kernel] [k] do_raw_spin_lock
8.30% [kernel] [k] page_frag_free
7.06% [mlx5_core] [k] mlx5e_xmit
5.97% [kernel] [k] acpi_processor_ffh_cstate_enter
5.73% [kernel] [k] fib_table_lookup
4.81% [mlx5_core] [k] mlx5e_poll_tx_cq
4.51% [mlx5_core] [k] skb_from_cqe.isra.32
3.81% [kernel] [k] virt_to_head_page
2.45% [kernel] [k] __dev_queue_xmit
1.84% [kernel] [k] ipt_do_table
1.77% [kernel] [k] napi_consume_skb
1.62% [kernel] [k] __build_skb
1.46% [kernel] [k] netif_skb_features
1.43% [kernel] [k] __netif_receive_skb_core
1.41% [kernel] [k] ip_rcv
1.08% [kernel] [k] dev_hard_start_xmit
1.02% [kernel] [k] build_skb
1.00% [mlx5_core] [k] mlx5_cqwq_get_cqe
0.96% [kernel] [k] ip_route_input_rcu
0.95% [kernel] [k] ip_forward
0.89% [kernel] [k] ip_finish_output2
0.89% [kernel] [k] kmem_cache_alloc
0.78% [kernel] [k] __local_bh_enable_ip
0.76% [kernel] [k] udp_v4_early_demux
0.75% [kernel] [k] compound_head
0.75% [kernel] [k] __netdev_pick_tx
0.73% [kernel] [k] sch_direct_xmit
0.65% [kernel] [k] irq_entries_start
0.63% [mlx5_core] [k] mlx5e_free_rx_wqe_reuse
0.61% [kernel] [k] netdev_pick_tx
0.61% [kernel] [k] validate_xmit_skb
0.55% [kernel] [k] skb_network_protocol
0.53% [mlx5_core] [k] mlx5e_rx_cache_get
0.53% [mlx5_core] [k] mlx5e_build_rx_skb
0.51% [kernel] [k] ip_rcv_finish
0.50% [kernel] [k] eth_header
0.50% [kernel] [k] fib_validate_source
0.50% [mlx5_core] [k] mlx5e_handle_rx_cqe
0.48% [mlx5_core] [k] eq_update_ci
0.47% [kernel] [k] kmem_cache_free_bulk
0.44% [kernel] [k] deliver_ptype_list_skb
0.43% [kernel] [k] skb_release_data
0.42% [kernel] [k] cpuidle_enter_state
0.40% [kernel] [k] virt_to_head_page
0.39% [kernel] [k] vlan_dev_hard_start_xmit
0.39% [kernel] [k] neigh_connected_output
0.38% [kernel] [k] eth_type_vlan
0.35% [mlx5_core] [k] mlx5e_alloc_rx_wqe
0.32% [kernel] [k] nf_hook_slow
0.32% [kernel] [k] swiotlb_map_page
0.31% [kernel] [k] ip_finish_output
0.29% [kernel] [k] ip_output
0.28% [kernel] [k] skb_free_head
0.25% [kernel] [k] netif_receive_skb_internal
0.25% [kernel] [k] __jhash_nwords
Without hack:
14.25% [kernel] [k] dst_release
14.17% [kernel] [k] skb_dst_force
13.41% [kernel] [k] rt_cache_valid
11.47% [kernel] [k] ip_finish_output2
7.01% [kernel] [k] do_raw_spin_lock
5.07% [kernel] [k] page_frag_free
3.47% [mlx5_core] [k] mlx5e_xmit
2.88% [kernel] [k] fib_table_lookup
2.43% [mlx5_core] [k] skb_from_cqe.isra.32
1.97% [kernel] [k] virt_to_head_page
1.81% [mlx5_core] [k] mlx5e_poll_tx_cq
0.93% [kernel] [k] __dev_queue_xmit
0.87% [kernel] [k] __build_skb
0.84% [kernel] [k] ipt_do_table
0.79% [kernel] [k] ip_rcv
0.79% [kernel] [k] acpi_processor_ffh_cstate_enter
0.78% [kernel] [k] netif_skb_features
0.73% [kernel] [k] __netif_receive_skb_core
0.52% [kernel] [k] dev_hard_start_xmit
0.52% [kernel] [k] build_skb
0.51% [kernel] [k] ip_route_input_rcu
0.50% [kernel] [k] skb_unref
0.49% [kernel] [k] ip_forward
0.48% [mlx5_core] [k] mlx5_cqwq_get_cqe
0.44% [kernel] [k] udp_v4_early_demux
0.41% [kernel] [k] napi_consume_skb
0.40% [kernel] [k] __local_bh_enable_ip
0.39% [kernel] [k] ip_rcv_finish
0.39% [kernel] [k] kmem_cache_alloc
0.38% [kernel] [k] sch_direct_xmit
0.33% [kernel] [k] validate_xmit_skb
0.32% [mlx5_core] [k] mlx5e_free_rx_wqe_reuse
0.29% [kernel] [k] netdev_pick_tx
0.28% [mlx5_core] [k] mlx5e_build_rx_skb
0.27% [kernel] [k] deliver_ptype_list_skb
0.26% [kernel] [k] fib_validate_source
0.26% [mlx5_core] [k] mlx5e_napi_poll
0.26% [mlx5_core] [k] mlx5e_handle_rx_cqe
0.26% [mlx5_core] [k] mlx5e_rx_cache_get
0.25% [kernel] [k] eth_header
0.23% [kernel] [k] skb_network_protocol
0.20% [kernel] [k] nf_hook_slow
0.20% [kernel] [k] vlan_passthru_hard_header
0.20% [kernel] [k] vlan_dev_hard_start_xmit
0.19% [kernel] [k] swiotlb_map_page
0.18% [kernel] [k] compound_head
0.18% [kernel] [k] neigh_connected_output
0.18% [mlx5_core] [k] mlx5e_alloc_rx_wqe
0.18% [kernel] [k] ip_output
0.17% [kernel] [k] prefetch_freepointer.isra.70
0.17% [kernel] [k] __slab_free
0.16% [kernel] [k] eth_type_vlan
0.16% [kernel] [k] ip_finish_output
0.15% [kernel] [k] kmem_cache_free_bulk
0.14% [kernel] [k] netif_receive_skb_internal
W dniu 2017-08-15 o 11:11, Paweł Staszewski pisze:
> Hi
>
>
> Yes it helped - now there is almost no difference when using vlans or
> not:
>
> 10.5Mpps - with vlan
>
> 11Mpps - without vlan
>
>
>
>
> W dniu 2017-08-15 o 03:17, Eric Dumazet pisze:
>> On Mon, 2017-08-14 at 18:07 -0700, Eric Dumazet wrote:
>>
>>> Or try to hack the IFF_XMIT_DST_RELEASE flag on the vlan netdev.
>> Something like :
>>
>> diff --git a/net/8021q/vlan_netlink.c b/net/8021q/vlan_netlink.c
>> index
>> 5e831de3103e2f7092c7fa15534def403bc62fb4..9472de846d5c0960996261cb2843032847fa4bf7
>> 100644
>> --- a/net/8021q/vlan_netlink.c
>> +++ b/net/8021q/vlan_netlink.c
>> @@ -143,6 +143,7 @@ static int vlan_newlink(struct net *src_net,
>> struct net_device *dev,
>> vlan->vlan_proto = proto;
>> vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]);
>> vlan->real_dev = real_dev;
>> + dev->priv_flags |= (real_dev->priv_flags & IFF_XMIT_DST_RELEASE);
>> vlan->flags = VLAN_FLAG_REORDER_HDR;
>> err = vlan_check_real_dev(real_dev, vlan->vlan_proto,
>> vlan->vlan_id);
>>
>>
>>
>>
>
>
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