On Wed, 6 Dec 2023 13:41:49 +0100 Jesper Dangaard Brouer wrote: > BUT then I realized that PP have a weakness, which is the return/free > path that need to take a normal spin_lock, as that can be called from > any CPU (unlike the RX/alloc case). Thus, I fear that making multiple > devices share a page_pool via softnet_data, increase the chance of lock > contention when packets are "freed" returned/recycled. I was thinking we can add a pcpu CPU ID to page pool so that napi_pp_put_page() has a chance to realize that its on the "right CPU" and feed the cache directly.
