linux-kernel - Re: [PATCH net-next v3 00/10] UDP/IPv6 refactoring

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Date:   Mon, 16 May 2022 15:48:27 +0200
From:   Paolo Abeni <pabeni@...hat.com>
To:     Pavel Begunkov <asml.silence@...il.com>, netdev@...r.kernel.org,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     David Ahern <dsahern@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v3 00/10] UDP/IPv6 refactoring

Hello,

On Fri, 2022-05-13 at 16:26 +0100, Pavel Begunkov wrote:
> Refactor UDP/IPv6 and especially udpv6_sendmsg() paths. The end result looks
> cleaner than it was before and the series also removes a bunch of instructions
> and other overhead from the hot path positively affecting performance.
> 
> Testing over dummy netdev with 16 byte packets yields 2240481 tx/s,
> comparing to 2203417 tx/s previously, which is around +1.6%

I personally feel that some patches in this series have a relevant
chance of introducing functional regressions and e.g. syzbot will not
help to catch them. That risk is IMHO relevant considered that the
performance gain here looks quite limited.

There are a few individual changes that IMHO looks like nice cleanup
e.g. patch 5, 6, 8, 9 and possibly even patch 1.

I suggest to reduce the patchset scope to them.

Thanks!

Paolo