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Date: Thu, 24 Oct 2013 21:06:40 -0700 From: Eric Dumazet <eric.dumazet@...il.com> To: Alexei Starovoitov <ast@...mgrid.com> Cc: Eric Dumazet <edumazet@...gle.com>, Stephen Hemminger <stephen@...workplumber.org>, "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org Subject: Re: vxlan gso is broken by stackable gso_segment() On Thu, 2013-10-24 at 18:59 -0700, Alexei Starovoitov wrote: > gre seems to be fine. > packets seem to be segmented with wrong length and being dropped. > After client iperf is finished, in few seconds I see the warning: > > [ 329.669685] WARNING: CPU: 3 PID: 3817 at net/core/skbuff.c:3474 > skb_try_coalesce+0x3a0/0x3f0() > [ 329.669688] Modules linked in: vxlan ip_tunnel veth ip6table_filter > ip6_tables ebtable_nat ebtables nf_conntrack_ipv4 nf_defrag_ipv4 > xt_state nf_conntrack xt_CHECKSUM iptable_mangle ipt_REJECT xt_tcpudp > iptable_filter ip_tables x_tables bridge stp llc vhost_net macvtap > macvlan vhost kvm_intel kvm iscsi_tcp libiscsi_tcp libiscsi > scsi_transport_iscsi dm_crypt hid_generic eeepc_wmi asus_wmi > sparse_keymap mxm_wmi dm_multipath psmouse serio_raw usbhid hid > parport_pc ppdev firewire_ohci e1000e firewire_core lpc_ich crc_itu_t > binfmt_misc igb dca ptp pps_core mac_hid wmi lp parport i2o_config > i2o_block video > [ 329.669746] CPU: 3 PID: 3817 Comm: iperf Not tainted 3.12.0-rc6+ #81 > [ 329.669748] Hardware name: System manufacturer System Product > Name/P8Z77 WS, BIOS 3007 07/26/2012 > [ 329.669750] 0000000000000009 ffff88082fb839d8 ffffffff8175427a > 0000000000000002 > [ 329.669756] 0000000000000000 ffff88082fb83a18 ffffffff8105206c > ffff880808f926f8 > [ 329.669760] ffff8807ef122b00 ffff8807ef122a00 0000000000000576 > ffff88082fb83a94 > [ 329.669765] Call Trace: > [ 329.669767] <IRQ> [<ffffffff8175427a>] dump_stack+0x55/0x76 > [ 329.669779] [<ffffffff8105206c>] warn_slowpath_common+0x8c/0xc0 > [ 329.669783] [<ffffffff810520ba>] warn_slowpath_null+0x1a/0x20 > [ 329.669787] [<ffffffff816150f0>] skb_try_coalesce+0x3a0/0x3f0 > [ 329.669793] [<ffffffff8167bce4>] tcp_try_coalesce.part.44+0x34/0xa0 > [ 329.669797] [<ffffffff8167d168>] tcp_queue_rcv+0x108/0x150 > [ 329.669801] [<ffffffff8167f129>] tcp_data_queue+0x299/0xd00 > [ 329.669806] [<ffffffff816822f4>] tcp_rcv_established+0x2d4/0x8f0 > [ 329.669809] [<ffffffff8168d8b5>] tcp_v4_do_rcv+0x295/0x520 > [ 329.669813] [<ffffffff8168fb08>] tcp_v4_rcv+0x888/0xc30 > [ 329.669818] [<ffffffff816651d3>] ? ip_local_deliver_finish+0x43/0x480 > [ 329.669823] [<ffffffff810cae04>] ? __lock_is_held+0x54/0x80 > [ 329.669827] [<ffffffff816652fb>] ip_local_deliver_finish+0x16b/0x480 > [ 329.669831] [<ffffffff816651d3>] ? ip_local_deliver_finish+0x43/0x480 > [ 329.669836] [<ffffffff81666018>] ip_local_deliver+0x48/0x80 > [ 329.669840] [<ffffffff81665770>] ip_rcv_finish+0x160/0x770 > [ 329.669845] [<ffffffff816662f8>] ip_rcv+0x2a8/0x3e0 > [ 329.669849] [<ffffffff81623d13>] __netif_receive_skb_core+0xa63/0xdb0 > [ 329.669853] [<ffffffff816233b8>] ? __netif_receive_skb_core+0x108/0xdb0 > [ 329.669858] [<ffffffff8175d37f>] ? _raw_spin_unlock_irqrestore+0x3f/0x70 > [ 329.669862] [<ffffffff8162417b>] ? process_backlog+0xab/0x180 > [ 329.669866] [<ffffffff81624081>] __netif_receive_skb+0x21/0x70 > [ 329.669869] [<ffffffff81624184>] process_backlog+0xb4/0x180 > [ 329.669873] [<ffffffff81626d08>] ? net_rx_action+0x98/0x350 > [ 329.669876] [<ffffffff81626dca>] net_rx_action+0x15a/0x350 > [ 329.669882] [<ffffffff81057f97>] __do_softirq+0xf7/0x3f0 > [ 329.669886] [<ffffffff8176820c>] call_softirq+0x1c/0x30 > [ 329.669887] <EOI> [<ffffffff81004bed>] do_softirq+0x8d/0xc0 > [ 329.669896] [<ffffffff8160de03>] ? release_sock+0x193/0x1f0 > [ 329.669901] [<ffffffff81057a5b>] local_bh_enable_ip+0xdb/0xf0 > [ 329.669906] [<ffffffff8175d2e4>] _raw_spin_unlock_bh+0x44/0x50 > [ 329.669910] [<ffffffff8160de03>] release_sock+0x193/0x1f0 > [ 329.669914] [<ffffffff81679237>] tcp_recvmsg+0x467/0x1030 > [ 329.669919] [<ffffffff816ab424>] inet_recvmsg+0x134/0x230 > [ 329.669923] [<ffffffff8160a17d>] sock_recvmsg+0xad/0xe0 > > to reproduce do: > $ sudo brctl addbr br0 > $ sudo ifconfig br0 up > $ cat foo1.conf > lxc.network.type = veth > lxc.network.flags = up > lxc.network.link = br0 > lxc.network.ipv4 = 10.2.3.5/24 > $sudo lxc-start -n foo1 -f ./foo1.conf bash > #ip li add vxlan0 type vxlan id 42 group 239.1.1.1 dev eth0 > #ip addr add 192.168.99.1/24 dev vxlan0 > #ip link set up dev vxlan0 > #iperf -s > > similar for another lxc with different IP > $sudo lxc-start -n foo2 -f ./foo2.conf bash > #ip li add vxlan0 type vxlan id 42 group 239.1.1.1 dev eth0 > #ip addr add 192.168.99.2/24 dev vxlan0 > #ip link set up dev vxlan0 > # iperf -c 192.168.99.1 > > I keep hitting it all the time. > > Thanks for all these details. I am in Edinburgh for the Kernel Summit, I'll take a look at this as soon as possible. > On Thu, Oct 24, 2013 at 5:41 PM, Eric Dumazet <eric.dumazet@...il.com> wrote: > > On Thu, 2013-10-24 at 16:37 -0700, Alexei Starovoitov wrote: > >> Hi Eric, Stephen, > >> > >> it seems commit 3347c960 "ipv4: gso: make inet_gso_segment() stackable" > >> broke vxlan gso > >> > >> the way to reproduce: > >> start two lxc with veth and bridge between them > >> create vxlan dev in both containers > >> do iperf > >> > >> this setup on net-next does ~80 Mbps and a lot of tcp retransmits. > >> reverting 3347c960 and d3e5e006 gets performance back to ~230 Mbps > >> > >> I guess vxlan driver suppose to set encap_level ? Some other way? > > > > Hi Alexei > > > > Are the GRE tunnels broken as well for you ? > > > > In my testings, GRE was working, and it looks GRE and vxlan has quite > > similar gso implementation. > > > > Maybe you can capture some of the broken frames with tcpdump ? > > > > > > > -- > To unsubscribe from this list: send the line "unsubscribe netdev" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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