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...tions. A bridge does not verify transport layer > checksums OTOH? Hi Willem. No, think about GRO(In the GRO we don't know packets will be forwarded to other ports or to local). The call tree 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 brid...

...:4881 > napi_skb_finish net/core/dev.c:5270 [inline] > napi_gro_receive+0x465/0x5c0 net/core/dev.c:5301 > receive_buf+0xc97/0x2bf0 drivers/net/virtio_net.c:996 > virtnet_receive drivers/net/virtio_net.c:1252 [inline] > virtnet_poll+0x3d5/0xe3d drivers/net/virtio_net.c:1334 > napi_poll net/core/dev.c:5926 [inline] > net_rx_action+0x7a5/0x1950 net/core/dev.c:5992 > __do_softirq+0x2e8/0xb17 kernel/softirq.c:288 > invoke_softirq kernel/softirq.c:368 [inline] > irq_exit+0x1d1/0x200 kernel/softirq.c:408 > exiting_irq arch/x86/include/asm/apic.h:527 [inline] >...

...__netdev_alloc_skb+0xda/0x120 [59826.077733] [<ffffffff810d0a5a>] ? activate_task+0x7a/0x90 [59826.077733] [<ffffffffc0027368>] rhine_rx+0x2b8/0x530 [via_rhine] [59826.077733] [<ffffffffc00276be>] rhine_napipoll+0xde/0x190 [via_rhine] [59826.077733] [<ffffffff817abfdb>] napi_poll+0xdb/0x1f0 [59826.077733] [<ffffffff81119aae>] ? process_timeout+0xe/0x10 [59826.077733] [<ffffffff81119732>] ? call_timer_fn+0x42/0x140 [59826.077733] [<ffffffff817ac1b5>] net_rx_action+0xc5/0x240 [59826.077733] [<ffffffff8111b1d6>] ? run_timer_softirq+0x276/0x2c0 [598...

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

...report_error mm/kasan/report.c:354 [inline] > kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412 > __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 > virtnet_receive drivers/net/virtio_net.c:1356 [inline] > virtnet_poll+0x111a/0x1226 drivers/net/virtio_net.c:1421 > napi_poll net/core/dev.c:6214 [inline] > net_rx_action+0x7a5/0x1920 net/core/dev.c:6280 > __do_softirq+0x2e8/0xb17 kernel/softirq.c:292 > do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1046 > </IRQ> > do_softirq.part.18+0x155/0x1a0 kernel/softirq.c:336 > do_softirq ar...

...report_error mm/kasan/report.c:354 [inline] > kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412 > __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 > virtnet_receive drivers/net/virtio_net.c:1356 [inline] > virtnet_poll+0x111a/0x1226 drivers/net/virtio_net.c:1421 > napi_poll net/core/dev.c:6214 [inline] > net_rx_action+0x7a5/0x1920 net/core/dev.c:6280 > __do_softirq+0x2e8/0xb17 kernel/softirq.c:292 > do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1046 > </IRQ> > do_softirq.part.18+0x155/0x1a0 kernel/softirq.c:336 > do_softirq ar...

...ort.c:354 [inline] > > kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412 > > __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 > > virtnet_receive drivers/net/virtio_net.c:1356 [inline] > > virtnet_poll+0x111a/0x1226 drivers/net/virtio_net.c:1421 > > napi_poll net/core/dev.c:6214 [inline] > > net_rx_action+0x7a5/0x1920 net/core/dev.c:6280 > > __do_softirq+0x2e8/0xb17 kernel/softirq.c:292 > > do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1046 > > </IRQ> > > do_softirq.part.18+0x155/0x1a0 kernel/softirq....