[Linuxarm] Re: [PATCH net-next v2 3/3] skbuff: keep track of pp page when __skb_frag_ref() is called

On Wed, Sep 15, 2021 at 7:05 PM Yunsheng Lin <linyunsheng@huawei.com> wrote:

As memtioned before, Tx recycling is based on page_pool instance per socket. it shares the page_pool instance with rx.

Anyway, based on feedback from edumazet and dsahern, I am still trying to see if the page pool is meaningful for tx.

It is not for generic linux TCP stack, but perhaps for benchmarks. Unless you dedicate one TX/RX pair per TCP socket ? Most high performance TCP flows are using zerocopy, I am really not sure why we would need to 'optimize' the path that is wasting cpu cycles doing user->kernel copies anyway, at the cost of insane complexity.