Public bug reported:

Significant network performance degradation when using Broadcom
BCM57800/BCM57810 (bnx2x) NICs on Ubuntu Jammy with kernels starting
from 6.8.0-38, with the issue becoming severe and rendering the system
unusable from 6.8.0-40 onwards.

There is a similar report here: 
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2098961
However, the proposed fix in that report does not resolve the issue for 
BCM57800 using the bnx2x driver.

Environment:
OS: Ubuntu 22.04(Jammy Jellyfish)
Current HWE Kernel: 6.8.0-57.59~22.04.1
NIC: Broadcom BCM57800 / BCM57810
Driver: bnx2x

Observed Behavior:
Noticeable network degradation begins in kernel 6.8.0-38
Becomes unusable in kernel 6.8.0-40 and beyond
Still reproducible in latest HWE kernel 6.8.0-57

Expected Behavior:
Stable and performant network performance as seen in previous kernel versions

Additional Notes: As mentioned in LP#2098961, the issue appears to be
fixed in kernel 6.12.18[0].

Request that this fix be backported or that further investigation be
made into kernel regressions affecting bnx2x on these NICs.

[0] https://kernel.ubuntu.com/mainline/v6.12.18/

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2107347

Title:
  Severe Network Performance Regression with BCM57800/BCM57810 on Kernel
  6.8.0-38 through 6.12.17

Status in linux package in Ubuntu:
  New

Bug description:
  Significant network performance degradation when using Broadcom
  BCM57800/BCM57810 (bnx2x) NICs on Ubuntu Jammy with kernels starting
  from 6.8.0-38, with the issue becoming severe and rendering the system
  unusable from 6.8.0-40 onwards.

  There is a similar report here: 
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2098961
  However, the proposed fix in that report does not resolve the issue for 
BCM57800 using the bnx2x driver.

  Environment:
  OS: Ubuntu 22.04(Jammy Jellyfish)
  Current HWE Kernel: 6.8.0-57.59~22.04.1
  NIC: Broadcom BCM57800 / BCM57810
  Driver: bnx2x

  Observed Behavior:
  Noticeable network degradation begins in kernel 6.8.0-38
  Becomes unusable in kernel 6.8.0-40 and beyond
  Still reproducible in latest HWE kernel 6.8.0-57

  Expected Behavior:
  Stable and performant network performance as seen in previous kernel versions

  Additional Notes: As mentioned in LP#2098961, the issue appears to be
  fixed in kernel 6.12.18[0].

  Request that this fix be backported or that further investigation be
  made into kernel regressions affecting bnx2x on these NICs.

  [0] https://kernel.ubuntu.com/mainline/v6.12.18/

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