Date: Tue, 21 Oct 2025 15:56:32 +0000 From: bugzilla-noreply@freebsd.org To: net@FreeBSD.org Subject: [Bug 276760] vtnet driver incorrectly calculates checksums Message-ID: <bug-276760-7501-fehNrGDBR5@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-276760-7501@https.bugs.freebsd.org/bugzilla/> References: <bug-276760-7501@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276760 --- Comment #36 from vova@fbsd.ru --- (In reply to Michael Tuexen from comment #35) > Is the sysctl output from 14.3 or stable/14? stable/14 new measurements on original VM (cx11): (reboot for each re-configuration) summary: FreeBSD Offloading Download (CV%) delta % Upload (CV%) delta % 14.3p4 yes 879 (24.21%) 456 (24.21%) 14.3p4 no 902 (13.36%) +2.59% 472 (13.36%) +3.60% 14-087fc6ae0a8c yes 877 (18.19%) -2.73% 476 (18.19%) +0.95% 14-087fc6ae0a8c no 877 (24.66%) -0.02% 404 (24.66%) -15.13% In general, I would assess results as - these cheap VMs do not provide any stable results to do such kind of measures, spikes are quite significant (shared hosting?). Also, I do not see much correlation on top of FreeBSD version or checksum offloading. Also, somehow, download is ~ twice faster than upload, no clue why ... Raw data (far-non-average results marked): FreeBSD Offloading Try Download Upload 14.3p4 yes 1 987 484 14.3p4 yes 2 963 532 14.3p4 yes 3 969 491 14.3p4 yes 4 828 405 14.3p4 yes 5 898 339 14.3p4 yes 6 984 490 14.3p4 yes 7 973 517 14.3p4 yes 8 922 499 14.3p4 yes 9 290 103 <<<<< 14.3p4 yes 10 974 695 14.3p4 yes avg 879 456 CV% 22.00% 33.20% 14.3p4 no 1 949 302 14.3p4 no 2 571 436 14.3p4 no 3 895 451 14.3p4 no 4 941 487 14.3p4 no 5 990 490 14.3p4 no 6 900 561 14.3p4 no 7 900 492 14.3p4 no 8 978 496 14.3p4 no 9 938 494 14.3p4 no 10 954 509 14.3p4 no avg 902 472 CV% 12.40% 13.40% 14-087fc6ae0a8c yes 1 936 538 14-087fc6ae0a8c yes 2 974 484 14-087fc6ae0a8c yes 3 752 441 14-087fc6ae0a8c yes 4 827 426 14-087fc6ae0a8c yes 5 965 493 14-087fc6ae0a8c yes 6 988 495 14-087fc6ae0a8c yes 7 981 524 14-087fc6ae0a8c yes 8 872 557 14-087fc6ae0a8c yes 9 991 500 14-087fc6ae0a8c yes 10 484 306 14-087fc6ae0a8c yes avg 877 476 CV% 18.19% 15.13% 14-087fc6ae0a8c no 1 942 485 14-087fc6ae0a8c no 2 956 489 14-087fc6ae0a8c no 3 970 517 14-087fc6ae0a8c no 4 868 493 14-087fc6ae0a8c no 5 965 467 14-087fc6ae0a8c no 6 988 528 14-087fc6ae0a8c no 7 277 98 <<<< 14-087fc6ae0a8c no 8 963 384 14-087fc6ae0a8c no 9 848 490 14-087fc6ae0a8c no 10 992 94 <<<< 14-087fc6ae0a8c no avg 877 404 CV% 24.66% 41.31% Command used to get statistics: for i in `seq 1 10`; do speedtest-go --server 60469 | awk '($2 == "Download:") { printf("%s\t", $3); } ($2 == "Upload:") { printf("%s\n", $3); }' done more info from sysctls on stable/14-087fc6ae0a8c: ifconfig_vtnet0="DHCP -tso4 -tso6 -lro -rxcsum" [root@mb0 /usr/home/vova]# sysctl dev.vtnet.0 dev.vtnet.0.txq0.rescheduled: 0 dev.vtnet.0.txq0.tso: 0 dev.vtnet.0.txq0.csum: 10705229 dev.vtnet.0.txq0.omcasts: 7 dev.vtnet.0.txq0.obytes: 7014701105 dev.vtnet.0.txq0.opackets: 10705766 dev.vtnet.0.rxq0.rescheduled: 0 dev.vtnet.0.rxq0.host_lro: 0 dev.vtnet.0.rxq0.csum_failed: 0 dev.vtnet.0.rxq0.csum: 2265936 dev.vtnet.0.rxq0.ierrors: 0 dev.vtnet.0.rxq0.iqdrops: 0 dev.vtnet.0.rxq0.ibytes: 14080902273 dev.vtnet.0.rxq0.ipackets: 11187201 dev.vtnet.0.tx_task_rescheduled: 0 dev.vtnet.0.tx_tso_offloaded: 0 dev.vtnet.0.tx_csum_offloaded: 10705229 dev.vtnet.0.tx_defrag_failed: 0 dev.vtnet.0.tx_defragged: 0 dev.vtnet.0.tx_tso_without_csum: 0 dev.vtnet.0.tx_tso_not_tcp: 0 dev.vtnet.0.tx_csum_proto_mismatch: 0 dev.vtnet.0.tx_csum_unknown_ethtype: 0 dev.vtnet.0.rx_task_rescheduled: 0 dev.vtnet.0.rx_csum_offloaded: 2265936 dev.vtnet.0.rx_csum_failed: 0 dev.vtnet.0.rx_csum_inaccessible_ipproto: 0 dev.vtnet.0.rx_csum_bad_offset: 0 dev.vtnet.0.rx_csum_bad_ipproto: 0 dev.vtnet.0.rx_csum_bad_ethtype: 0 dev.vtnet.0.rx_mergeable_failed: 0 dev.vtnet.0.rx_enq_replacement_failed: 0 dev.vtnet.0.rx_frame_too_large: 0 dev.vtnet.0.mbuf_alloc_failed: 0 dev.vtnet.0.act_vq_pairs: 1 dev.vtnet.0.req_vq_pairs: 1 dev.vtnet.0.max_vq_pairs: 1 dev.vtnet.0.%iommu: dev.vtnet.0.%parent: virtio_pci0 dev.vtnet.0.%pnpinfo: vendor=0x00001af4 device=0x1000 subvendor=0x1af4 device_type=0x00000001 dev.vtnet.0.%location: dev.vtnet.0.%driver: vtnet dev.vtnet.0.%desc: VirtIO Networking Adapter # sysctl hw.vtnet hw.vtnet.lro_mbufq_depth: 0 hw.vtnet.lro_entry_count: 128 hw.vtnet.rx_process_limit: 1024 hw.vtnet.tso_maxlen: 65535 hw.vtnet.mq_max_pairs: 32 hw.vtnet.mq_disable: 0 hw.vtnet.lro_disable: 1 hw.vtnet.tso_disable: 0 hw.vtnet.fixup_needs_csum: 0 stable/14-087fc6ae0a8c: ifconfig_vtnet0="DHCP" # ifconfig vtnet0 vtnet0: flags=1008843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST,LOWER_UP> metric 0 mtu 1500 options=ec07bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,LRO,VLAN_HWTSO,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6,HWSTATS> # sysctl dev.vtnet.0 dev.vtnet.0.txq0.rescheduled: 0 dev.vtnet.0.txq0.tso: 311575 dev.vtnet.0.txq0.csum: 11032984 dev.vtnet.0.txq0.omcasts: 7 dev.vtnet.0.txq0.obytes: 8466101606 dev.vtnet.0.txq0.opackets: 11033797 dev.vtnet.0.rxq0.rescheduled: 0 dev.vtnet.0.rxq0.host_lro: 0 dev.vtnet.0.rxq0.csum_failed: 0 dev.vtnet.0.rxq0.csum: 12244247 dev.vtnet.0.rxq0.ierrors: 0 dev.vtnet.0.rxq0.iqdrops: 0 dev.vtnet.0.rxq0.ibytes: 15515499836 dev.vtnet.0.rxq0.ipackets: 12244260 dev.vtnet.0.tx_task_rescheduled: 0 dev.vtnet.0.tx_tso_offloaded: 311575 dev.vtnet.0.tx_csum_offloaded: 11032984 dev.vtnet.0.tx_defrag_failed: 0 dev.vtnet.0.tx_defragged: 0 dev.vtnet.0.tx_tso_without_csum: 0 dev.vtnet.0.tx_tso_not_tcp: 0 dev.vtnet.0.tx_csum_proto_mismatch: 0 dev.vtnet.0.tx_csum_unknown_ethtype: 0 dev.vtnet.0.rx_task_rescheduled: 0 dev.vtnet.0.rx_csum_offloaded: 12244247 dev.vtnet.0.rx_csum_failed: 0 dev.vtnet.0.rx_csum_inaccessible_ipproto: 0 dev.vtnet.0.rx_csum_bad_offset: 0 dev.vtnet.0.rx_csum_bad_ipproto: 0 dev.vtnet.0.rx_csum_bad_ethtype: 0 dev.vtnet.0.rx_mergeable_failed: 0 dev.vtnet.0.rx_enq_replacement_failed: 0 dev.vtnet.0.rx_frame_too_large: 0 dev.vtnet.0.mbuf_alloc_failed: 0 dev.vtnet.0.act_vq_pairs: 1 dev.vtnet.0.req_vq_pairs: 1 dev.vtnet.0.max_vq_pairs: 1 dev.vtnet.0.%iommu: dev.vtnet.0.%parent: virtio_pci0 dev.vtnet.0.%pnpinfo: vendor=0x00001af4 device=0x1000 subvendor=0x1af4 device_type=0x00000001 dev.vtnet.0.%location: dev.vtnet.0.%driver: vtnet dev.vtnet.0.%desc: VirtIO Networking Adapter # sysctl hw.vtnet hw.vtnet.lro_mbufq_depth: 0 hw.vtnet.lro_entry_count: 128 hw.vtnet.rx_process_limit: 1024 hw.vtnet.tso_maxlen: 65535 hw.vtnet.mq_max_pairs: 32 hw.vtnet.mq_disable: 0 hw.vtnet.lro_disable: 1 hw.vtnet.tso_disable: 0 hw.vtnet.fixup_needs_csum: 0 hw.vtnet.csum_disable: 0 -- You are receiving this mail because: You are on the CC list for the bug.
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