[Bug 265714] igc(4) drops link under high traffic

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=265714

Nick Koss <nkoss1992@gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |nkoss1992@gmail.com

--- Comment #25 from Nick Koss <nkoss1992@gmail.com> ---
Hey Folks - Just wanted to cast my stone into the pond regarding this issue.
I'm running OPNsense on FreeBSD 14.2. I have an HP Flex IO i225 NIC installed
in my HP Elitedesk 800 G6 Mini. Current firmware version is 1.57. I am unable
to upgrade the nvm via nvmupdatemanager64 since the firmware is HP proprietary,
with 1.57 being the highest available version from HP.

I run the NIC at 2.5 Gbe. Under load, my speeds will drop down to around
500-600 Mb/s with large amounts of retries in iperf3. I can induce the speed
drop by rapidly starting/stopping iperf transfers.

I've tried everything - tunables, BIOS power settings/ASPM, AIM settings, EEE
settings. Nothing has remedied the issue.

I have an identical PC with the same NIC installed, which runs Linux (Proxmox).
The NIC in this machine does not experience any drops. This leads me to believe
that the Linux drivers are able to compensate for any NIC hardware/microcode
issues. The firmware of the NIC in the Linux box is also 1.57.

My pciconf output:

class=0x020000 rev=0x03 hdr=0x00 vendor=0x8086 device=0x15f3 subvendor=0x103c
subdevice=0x87b9

Hopefully as time goes on there may be a takeaway from the Linux driver that
FreeBSD implements. My feeling is that most folks experiencing issues with this
NIC have variants that are not OEM Intel.

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