search for: skb_checksum

...messages : (dom0 hostname is zen, domU hostname is ftp, directory is /xen/mount/ftp) Output from umount: Jun 2 12:13:16 zen kernel: Badness in local_bh_enable at kernel/softirq.c:140 Jun 2 12:13:16 zen kernel: [local_bh_enable+130/144] local_bh_enable+0x82/0x90 Jun 2 12:13:16 zen kernel: [skb_checksum+317/704] skb_checksum+0x13d/0x2c0 Jun 2 12:13:16 zen kernel: [udp_poll+154/352] udp_poll+0x9a/0x160 Jun 2 12:13:16 zen kernel: [sock_poll+41/64] sock_poll+0x29/0x40 Jun 2 12:13:16 zen kernel: [do_pollfd+149/160] do_pollfd+0x95/0xa0 Jun 2 12:13:16 zen kernel: [do_poll+106/208] do_poll+0x6a/0...

...ng if anyone can make sense of these errors in > the message log: > > Dec 23 14:14:31 localhost kernel: Badness in local_bh_enable > at kernel/softirq. > Dec 23 14:14:31 localhost kernel: [local_bh_enable+130/144] > local_bh_enable+0x Dec 23 14:14:31 localhost kernel: > [skb_checksum+317/704] skb_checksum+0x13d/0x Dec 23 14:14:31 > localhost kernel: [udp_poll+154/352] udp_poll+0x9a/0x160 Dec > 23 14:14:31 localhost kernel: [sock_poll+41/64] > sock_poll+0x29/0x40 Dec 23 14:14:31 localhost kernel: > [do_pollfd+149/160] do_pollfd+0x95/0xa0 Dec 23 14:14:31 >...

> Badness in local_bh_enable at kernel/softirq.c:140 > [<c011fb12>] local_bh_enable+0x82/0x90 [<c031fcfd>] > skb_checksum+0x13d/0x2d0 [<c016ac5c>] __pollwait+0x8c/0xd0 > [<c0360d3a>] udp_poll+0x9a/0x160 [<c031af49>] > sock_poll+0x29/0x40 [<c016b635>] do_pollfd+0x95/0xa0 > [<c016b6aa>] do_poll+0x6a/0xd0 [<c016b871>] > sys_poll+0x161/0x240 [<c011f14c>] sys...

...as below: + 5.41% secondary_startup_64 - 1.22% ret_from_fork .... net_rx_action napi_poll virtnet_poll virtnet_receive napi_gro_receive dev_gro_receive inet_gro_receive tcp4_gro_receive __skb_gro_checksum_complete skb_checksum __skb_checksum csum_partial do_csum - 1.13% do_csum $ brctl show bridge name bridge id STP enabled interfaces br0 8000.001122330001 no eth1 eth2 > > Fixes: a02e8964eaf9 ("virtio-net: ethtool configurable LRO") > > Cc: Michael S. Tsirkin <mst at...

...and the OOM killer doesn't kick in.. but I am seeing plenty of such messages in the logs ... Dec 2 16:05:21 noc kernel: Badness in local_bh_enable at kernel/softirq.c:141 Dec 2 16:05:21 noc kernel: [<c0121178>] local_bh_enable+0x47/0x6f Dec 2 16:05:21 noc kernel: [<c02177d5>] skb_checksum+0x133/0x25e Dec 2 16:05:21 noc kernel: [<c0250f06>] udp_poll+0x66/0x113 Dec 2 16:05:21 noc kernel: [<c02135fd>] sock_poll+0x19/0x1d Dec 2 16:05:21 noc kernel: [<c016d1a6>] do_select+0x190/0x2c7 Dec 2 16:05:21 noc kernel: [<c016ceb5>] __pollwait+0x0/0x9b Dec 2 16:05:...

...t) = 0x848695b3 kernel(__kmalloc) = 0x5a34a45c kernel(__list_add) = 0x0343a1a8 kernel(__nla_put) = 0x3e2e6f8c kernel(__nla_reserve) = 0x391515a6 kernel(__per_cpu_offset) = 0x32047ad5 kernel(__pskb_pull_tail) = 0xaa1b9b4e kernel(__put_net) = 0xcb27f3de kernel(__secpath_destroy) = 0x430555cc kernel(__skb_checksum_complete) = 0xcf0b750c kernel(__skb_warn_lro_forwarding) = 0x4d288688 kernel(__stack_chk_fail) = 0xf0fdf6cb kernel(__wake_up) = 0x642e54ac kernel(_read_lock) = 0x1a75caa3 kernel(_spin_lock) = 0x973873ab kernel(_spin_lock_bh) = 0x93cbd1ec kernel(_spin_lock_irq) = 0xecde1418 kernel(_spin_lock_irqsave...

...044e664>] __do_IRQ+0x0/0x118 May 4 12:46:03 ms7b kernel: [<c04074c4>] do_IRQ+0x9b/0xc3 May 4 12:46:03 ms7b kernel: [<c040597a>] common_interrupt+0x1a/0x20 May 4 12:46:03 ms7b kernel: [<c05f3518>] tcp_rcv_established+0x77c/0x784 May 4 12:46:03 ms7b kernel: [<c05c117e>] skb_checksum+0x52/0x282 May 4 12:46:03 ms7b kernel: [<c05f8522>] tcp_v4_do_rcv+0x25/0x2b6 May 4 12:46:03 ms7b kernel: [<c05faa9a>] tcp_v4_rcv+0x8e9/0x93b May 4 12:46:03 ms7b kernel: [<c05e21e1>] ip_local_deliver+0x15b/0x206 May 4 12:46:03 ms7b kernel: [<c05e204c>] ip_rcv+0x47f/0x4b9...

From: Tonghao Zhang <xiangxia.m.yue at gmail.com> Open vSwitch and Linux bridge will disable LRO of the interface when this interface added to them. Now when disable the LRO, the virtio-net csum is disable too. That drops the forwarding performance. Fixes: a02e8964eaf9 ("virtio-net: ethtool configurable LRO") Cc: Michael S. Tsirkin <mst at redhat.com> Cc: Jason Wang

From: Tonghao Zhang <xiangxia.m.yue at gmail.com> Open vSwitch and Linux bridge will disable LRO of the interface when this interface added to them. Now when disable the LRO, the virtio-net csum is disable too. That drops the forwarding performance. Fixes: a02e8964eaf9 ("virtio-net: ethtool configurable LRO") Cc: Michael S. Tsirkin <mst at redhat.com> Cc: Jason Wang

Below is a fix for the current problem of checksum offload not working in a NAT''ed network. The cause is the NAT/iptables code incorrectly modifying the TCP/UDP checksum (for the checksum offload case). The original code assumes a valid checksum, which is not the case for checksum offload packets (which has a complimented, partial checksum for the hardware to use). The fix is to

...linux-2.6.12-xen/net/ipv4/netfilter/ip_conntrack_proto_udp.c 2006-02-25 00:12:33.820986862 +0100 @@ -120,6 +120,7 @@ static int udp_error(struct sk_buff *skb * and moreover root might send raw packets. * FIXME: Source route IP option packets --RR */ @@ -103836,7 +103839,7 @@ : skb_checksum(skb, iph->ihl*4, udplen, 0))) { diff -Nurp pristine-linux-2.6.12/net/ipv4/netfilter/ip_conntrack_standalone.c linux-2.6.12-xen/net/ipv4/netfilter/ip_conntrack_standalone.c --- pristine-linux-2.6.12/net/ipv4/netfilter/ip_conntrack_standalone.c 2005-06-17 21:48:29.000000000 +0200 -+++ linux-2.6....