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

[Eric Dumazet]

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