Date: Thu, 16 Oct 2025 16:19:49 +0000 From: bugzilla-noreply@freebsd.org To: net@FreeBSD.org Subject: [Bug 276760] vtnet driver incorrectly calculates checksums Message-ID: <bug-276760-7501-AyHnWx0WMG@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 #30 from vova@fbsd.ru --- (In reply to Michael Tuexen from comment #29) hm ... good question, I've created a new VM and did series of tests: CPX22 (2 vCPU 4GB RAM, old CX11 is not available any more) IPv4, Nuremberg just install 14.3, upgrade to 14.3p4 (with freebsd-update), install speedtest-go package, copy stable/14-087fc6ae0a8c kernel build outside as alternative summarized results: FreeBSD Offloading Try Download Upload Mbps Mbps 14.3p4 yes 1 1,413 736 14.3p4 yes 2 1,348 833 14.3p4 yes 3 1,377 901 14.3p4 yes 4 1,357 737 14.3p4 yes 5 1,352 571 14.3p4 yes 6 1,247 776 14.3p4 yes avg 1,349 759 CV% 4.11% 14.71% 14.3p4 no 1 1,574 681 14.3p4 no 2 1,598 702 14.3p4 no 3 1,237 602 14.3p4 no 4 1,537 778 14.3p4 no 5 1,541 745 14.3p4 no 6 1,568 623 14.3p4 no avg 1,509 688 CV% 8.96% 9.90% 14-087fc6ae0a8c yes 1 1,210 675 14-087fc6ae0a8c yes 2 1,332 707 14-087fc6ae0a8c yes 3 1,684 703 14-087fc6ae0a8c yes 4 1,320 460 14-087fc6ae0a8c yes 5 1,333 694 14-087fc6ae0a8c yes 6 1,279 825 14-087fc6ae0a8c yes avg 1,360 677 CV% 12.18% 17.58% 14-087fc6ae0a8c no 1 1,466 807 14-087fc6ae0a8c no 2 1,213 751 14-087fc6ae0a8c no 3 1,527 678 14-087fc6ae0a8c no 4 1,825 1,037 14-087fc6ae0a8c no 5 1,185 1,064 14-087fc6ae0a8c no 6 1,230 1,086 14-087fc6ae0a8c no avg 1,408 904 CV% 17.71% 19.81% What is seen: 1. diviations/variations is quite high, so, clearely does not worth to trust data after one measurement (my bad) 2. still incomparable with yours 260 Mbps (both up and down) - we masure something different? 3. turning off TSOs add ~10-12% of download consistently, but for upload -> sometimes improves, sometimes not (ifconfig vtnet0 -tso4 -tso6 -lro -rxcsum) 4. and these results still did not match what I have in my production VM (will re-test with multiple measurements) # sysctl dev.vtnet.0 dev.vtnet.0.txq0.rescheduled: 0 dev.vtnet.0.txq0.tso: 1388393 dev.vtnet.0.txq0.csum: 20810001 dev.vtnet.0.txq0.omcasts: 0 dev.vtnet.0.txq0.obytes: 18916415358 dev.vtnet.0.txq0.opackets: 20810007 dev.vtnet.0.rxq0.rescheduled: 0 dev.vtnet.0.rxq0.host_lro: 216036 dev.vtnet.0.rxq0.csum_failed: 0 dev.vtnet.0.rxq0.csum: 17119906 dev.vtnet.0.rxq0.ierrors: 0 dev.vtnet.0.rxq0.iqdrops: 0 dev.vtnet.0.rxq0.ibytes: 36642213337 dev.vtnet.0.rxq0.ipackets: 24902539 dev.vtnet.0.tx_task_rescheduled: 0 dev.vtnet.0.tx_tso_offloaded: 0 dev.vtnet.0.tx_csum_offloaded: 0 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: 0 dev.vtnet.0.rx_csum_failed: 0 dev.vtnet.0.rx_csum_bad_proto: 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_pci1 dev.vtnet.0.%pnpinfo: vendor=0x00001af4 device=0x1041 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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