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I would start with the Kernel TLS tweak mentioned in other threads and see if it helps.

Could you please point me to the mentioned Kernel TLS tweak? I also get frequent reboots due to a kernel panic on my Topton N6005 box after the 26.7 upgrade:

Code Select Expand

Fatal trap 12: page fault while in kernel mode
fault virtual address = 0x0
panic: page fault

memmove_erms()
bpf_zerocopy_append_mbuf()
catchpacket()
bpf_mtap2()
ether_bpf_mtap_if()
lagg_transmit_ethernet() → vlan_transmit() → ether_output_frame()
ng_apply_item() → ng_snd_item() → ng_ether_output() → ether_output()
ip_output() → tcp_default_output() → tcp_usr_ready()
ktls_encrypt() → ktls_work_thread()

I've currently disabled net.bpf.zerocopy using a tunable (net.bpf.zerocopy_enable=0) and it actually seems to work for me, but maybe there is more elegant solution that I'm missing. Thanks!

My box is headless, so I cannot check right away. I will search for a monitor and try to find the resp. options in the next days.

Stability is overall fine for me. I had one or two crashes of the OPNsense VM after that but since i upgraded RAM and assigned more memory to the OPNsense VM it really runs smooth.
Did not benchmark, but the performance is great.

Hi chengair,

I checked the BIOS settings on my box and realized that in CPU options the Power Limit 2 was set to 27W by default, which is way too high. I manually limited the PL2 at 12,5W (should be the maximum for the N6005) and also disabled the Turbo Boost (don't know the exact setting anymore, but you can select 3 options and I chose the "middle" one).
The OPNsense VM is so far running stable, uptime is over 2 days now - which is a record for my Topton box.
I hope that the problem is solved now. I'll update in a few days.
Maybe that also helps you.

Thanks for the answer, I was afraid you'd reply that :-\

I also replaced the thermal grease of the Topton-Box with a good quality thermal pad to bridge the gap, but that of course did not solve the error.
I ordered the Topton box on aliexpress, I was rated quite well there. Did you by chance test OPNsese on the bare metal?

Hi chenganir,

did you find a solution in the meantime? I migrated from to a similar setup, I have OPNsense 22.7 installed in a Proxmox QEMU VM, also running on a Pentium N6005 in a Topton Mini PC) and have the same issues you described.
I copied the OPNsese VM from my old Proxmox box (Qotom with a Celeron CPU), the config itself was not changed, so I'm pretty sure this is not be a configuration issue in OPNsense.
I also have some LXC running in Proxmox they are not affected.