I would like to share some preliminary findings regarding this issue. According to the customer's description, the problem persists in mainline v6.12.16 but appears to be resolved in v6.12.17. On the Ubuntu side, a noticeable performance degradation has been observed in kernel version v6.8.0-40.
Upon reviewing the commits between v6.12.16 and the stable v6.12.17, one commit stands out as potentially relevant: 997ef6117efc tcp: adjust rcvq_space after updating scaling ratio This commit addresses the commit a2cbb1603943 (tcp: Update window clamping condition). The performance degradation may be linked to the commit 7d9aff859ddc (tcp: increase the default TCP scaling ratio), which is present in v6.8.0-40 but not in v6.8.0-39. It may be worthwhile to either revert this commit from mainline v6.12.17 or backport it to v6.8.0-40 for testing purposes. If the issue persists after testing, we could proceed with bisecting the commits between v6.12.16 and v6.12.17 to gather more insight. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2107347 Title: Severe Network Performance Regression with BCM57800/BCM57810 on Kernel 6.8.0-40 through 6.12.16 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2107347/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
