https://bugzilla.suse.com/show_bug.cgi?id=1231307 Bug ID: 1231307 Summary: Severe network performance issue with 6.4.0-150600.23.22 Classification: openSUSE Product: openSUSE Distribution Version: Leap 15.6 Hardware: Other OS: All Status: NEW Severity: Major Priority: P5 - None Component: Kernel:Networking Assignee: kernel-bugs@suse.de Reporter: itteam@smartodds.co.uk QA Contact: qa-bugs@suse.de Target Milestone: --- Found By: --- Blocker: --- I have several virtual machines running OpenSUSE Leap 15.6 in a Nutanix AHV environment. Since upgrading the kernel in several of these from 6.4.0-150600.23.17-default to 6.4.0-150600.23.22-default I am seeing a severe impact on network performance and reliability - slow transfer speeds and disconnections. This issue has been accompanied by these entries in /var/log/messages: 2024-10-04T10:22:08.639264+01:00 testserver1 kernel: message repeated 3 times: [[ C2] eth1: bad gso: type: 1, size: 1448] 2024-10-04T10:22:08.639265+01:00 testserver1 kernel: [ C2] eth1: bad gso: type: 1, size: 1388 2024-10-04T10:22:08.642595+01:00 testserver1 kernel: [ C2] eth1: bad gso: type: 1, size: 1448 2024-10-04T10:22:08.642602+01:00 testserver1 kernel: [ C2] eth1: bad gso: type: 1, size: 1448 Reverting to 6.4.0-150600.23.17 resolves the issue. NIC details: # ethtool -i eth1 driver: virtio_net version: 1.0.0 firmware-version: expansion-rom-version: bus-info: 0000:00:03.0 supports-statistics: yes supports-test: no supports-eeprom-access: no supports-register-dump: no supports-priv-flags: no # lspci -nn | grep Ethernet 00:03.0 Ethernet controller [0200]: Red Hat, Inc. Virtio network device [1af4:1000] Comparison of wget download speed of a 97MB file between the kernel versions (file is served via HTTP from another virtual machine in the same physical location): # uname -a Linux testserver1 6.4.0-150600.23.17-default #1 SMP PREEMPT_DYNAMIC Tue Jul 30 06:37:32 UTC 2024 (9c450d7) x86_64 x86_64 x86_64 GNU/Linux ... 2024-10-04 14:59:05 (262 MB/s) - ‘tmp.dat’ saved [101473111/101473111] # uname -a Linux testserver1 6.4.0-150600.23.22-default #1 SMP PREEMPT_DYNAMIC Fri Sep 13 10:42:50 UTC 2024 (5c05eeb) x86_64 x86_64 x86_64 GNU/Linux ... 2024-10-04 15:08:18 (899 KB/s) - ‘tmp.dat’ saved [101473111/101473111] -- You are receiving this mail because: You are on the CC list for the bug.