On Fri, 24 May 2019 12:17:27 +0800 Jason Wang <jasow...@redhat.com> wrote:
> > Maybe this is acceptable, but it should be documented, as the current > > assumption dictates: XDP program runs on the core where the XDP > > frame/SKB was first seen. > > > At lest for TUN, this is not true. XDP frames were built by vhost_net > and passed to TUN. There's no guarantee that vhost_net kthread won't > move to another core. This sound a little scary, as we depend on per-CPU variables (e.g. bpf_redirect_info). Can the vhost_net kthread move between CPUs within/during the NAPI-poll? -- Best regards, Jesper Dangaard Brouer MSc.CS, Principal Kernel Engineer at Red Hat LinkedIn: http://www.linkedin.com/in/brouer
