Hi,
Still no response from your end. Kind Regards, Bayozid Bostami Senior System Administrator I NOC Inspire Broadband Limited | 312, South Paikpara, Mirpur, Dhaka-1216, Bangladesh. Mob: +8801678331118 From: Jerome Tollet via lists.fd.io <[email protected]> To: "Bayozid Bostami"<[email protected]> Cc: <[email protected]> Date: Tue, 13 Oct 2026 16:18:25 +0600 Subject: Re: [vpp-dev] af_packet "tx frame not ready" and instability under CGNAT load Hi Bayozid, Thanks for the detailed outputs. I tested `ip route add 103.213.236.136/30 via drop` on VPP 26.06 debug, both through the CLI and during startup, with and without NAT and with zero or two workers. I could not reproduce the crash. This is valid blackhole-route syntax. I recommend moving packet processing to dedicated workers, separate from the main thread. Two workers and two RX queues per interface would be a reasonable starting point. The attached configuration uses `cpu { workers 2 }`, leaving CPU affinity selection to VPP. For your XL710, I suggest two SR-IOV VFs using VPP's native IAVF driver: one for each of your existing VLANs, 243 (outside) and 244 (inside). The PF remains under Linux's i40e driver for management; only the VFs are bound to vfio-pci. I validated the native configuration's interface initialization, queue assignment, MTUs, addresses, routes and NAT on a real XL710 using VPP 26.10, with laboratory addresses. This was not a traffic/load test. Please replace the PCI-address placeholders before use. Since your PF is currently bound to vfio-pci, restoring it to i40e should be done during a maintenance window with console access. The attached migration notes describe the precautions. To investigate the SIGABRT, could you provide: - `show version verbose`, the startup configuration and the smallest CLI script reproducing it; - the log lines immediately before the abort, especially any assertion or "Out-of-memory" message; - a full backtrace with matching debug symbols: `thread apply all bt full`; - `lspci -nnk`, so we can confirm the PF/VF devices and their drivers. Best regards, Jerome
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