linux-kernel - Re: [PATCH net-next 06/11] net: page_pool: avoid calling no-op externals when possible

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Date:   Wed, 17 May 2023 10:14:58 +0200
From:   Christoph Hellwig <hch@....de>
To:     Alexander Lobakin <aleksander.lobakin@...el.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        Michal Kubiak <michal.kubiak@...el.com>,
        Larysa Zaremba <larysa.zaremba@...el.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Christoph Hellwig <hch@....de>, netdev@...r.kernel.org,
        intel-wired-lan@...ts.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 06/11] net: page_pool: avoid calling no-op
 externals when possible

So while this looks ok, Eric Dumazet had looked into some optimization
for this touching the core code, and promised me to come up with an
even better version a while ago.  Eric, what's the state of your
optimizations for no-op DMA syncs?