Hey Vincent and Jesper,Thank you for the information and I will try these commands tonight when there is higher traffic load! The 'perf' command seems interesting.
Jesper, I do believe my kernel supports BPF Trace. I was able to use this function in our software while I was debugging it for a separate issue that I resolved earlier this week. With that said, the IPIP traffic is handled in the XDP program. We only redirect a certain packet to the AF_XDP program so it can be cached via a Redis server (needed in the user space). However, this doesn't happen that often and other packets handled by the XDP program itself are being dropped. Therefore, I doubt the AF_XDP program is causing anything.
Thank you! On 1/23/2020 7:11 AM, Jesper Dangaard Brouer wrote:
On Wed, 22 Jan 2020 12:02:23 -0600 Christian Deacon <gamemann@xxxxxxxxxxx> wrote:Hey everyone, I am new to XDP + AF_XDP (along with C programming in general), but I am very interested in it and I've been learning a lot recently. I own an Anycast network and our POP servers are running custom software our developer created that processes packets using XDP. This software basically forwards specific traffic to another machine via an IPIP tunnel.Why are you using AF_XDP to implement a simple IPIP tunnel header? You can easily implement it in BPF. Example here: https://github.com/torvalds/linux/blob/master/samples/bpf/xdp_tx_iptunnel_kern.c#L110-L112
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