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AJvYcCULvguxDCjWyPt+dn9JogLPuNsotVPTsOuKKdVE8xroteMa0b4exkjua/yLyE3x8GsRSLunYEY0hA==@vger.kernel.org X-Gm-Message-State: AOJu0Yyvpsu1nUulfnmxCS5mcLv07kSEN8VAoytYdQCD7d3XRCzC9/QU sk7VYNdg7lByB7vupa0OHhEw9gBqR42mVcpA/fT+eKfw7BG4V94A6Yun0i3sT+sxKW4Tlo0BZqx 9U6SFpz3wXwnyOYzoaHu7qW5VpjJJthztv2BC4yS8 X-Gm-Gg: ASbGncvRORfctnFR3Eg1K8vkYIPVwm5uUCEeG5owj6co/JdvhMXuOdzPPBpPrwz7/lX UKHXdBZz7l7eGbNNCmg8jMB+TXQToUALh3a4JKSP0W+K5e7BV4m5UJfy+xvJcGX4GBap+n09P/M Z/pv9rC5OHG/JjE6C+yOupi7rwwueY3G6X0An37stzidyw3C7OZgnt1wMoLAhoRV3tSQq8oJHW6 86euiqwZjyXHKrNC2WtJ5rsq1o0kymKajrO39WC7mF0 X-Google-Smtp-Source: AGHT+IEz9461t1FLeYjqAPV9IC+YLeWd69snIPkzWT8jdh/N0oHfH1jree3Vr3yZo117hlh5lONNshD+tvF4WSbIHxw= X-Received: by 2002:a05:6512:250d:b0:55b:7c73:c5f0 with SMTP id 2adb3069b0e04-55e0095dfb9mr92067e87.2.1755561026720; Mon, 18 Aug 2025 16:50:26 -0700 (PDT) Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 References: <353e0195a0f44800c0b5aa4a6d751d3655d9842b.1755499376.git.asml.silence@gmail.com> In-Reply-To: <353e0195a0f44800c0b5aa4a6d751d3655d9842b.1755499376.git.asml.silence@gmail.com> From: Mina Almasry Date: Mon, 18 Aug 2025 16:50:14 -0700 X-Gm-Features: Ac12FXym-AdI0-6m9FtombEI_KXbKYd4WM0Qi3aWvTpPx0DSoGpMt0F2tRTsGrw Message-ID: Subject: Re: [PATCH net-next v3 02/23] docs: ethtool: document that rx_buf_len must control payload lengths To: Pavel Begunkov Cc: Jakub Kicinski , netdev@vger.kernel.org, Eric Dumazet , Willem de Bruijn , Paolo Abeni , andrew+netdev@lunn.ch, horms@kernel.org, davem@davemloft.net, sdf@fomichev.me, dw@davidwei.uk, michael.chan@broadcom.com, dtatulea@nvidia.com, ap420073@gmail.com, linux-kernel@vger.kernel.org, io-uring@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, Aug 18, 2025 at 6:56=E2=80=AFAM Pavel Begunkov wrote: > > From: Jakub Kicinski > > Document the semantics of the rx_buf_len ethtool ring param. > Clarify its meaning in case of HDS, where driver may have > two separate buffer pools. > > The various zero-copy TCP Rx schemes we have suffer from memory nit: 'we have suffer' sounds weird, probably meant just 'suffer'. > management overhead. Specifically applications aren't too impressed > with the number of 4kB buffers they have to juggle. Zero-copy > TCP makes most sense with larger memory transfers so using > 16kB or 32kB buffers (with the help of HW-GRO) feels more > natural. > > Signed-off-by: Jakub Kicinski > Signed-off-by: Pavel Begunkov Reviewed-by: Mina Almasry --=20 Thanks, Mina