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[195.231.44.239]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4995c69c777sm295239355e9.2.2026.08.10.02.53.58 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 10 Aug 2026 02:53:58 -0700 (PDT) Message-ID: <9f7f0fa7-52e9-4640-9264-13c98ed4d602@redhat.com> Date: Mon, 10 Aug 2026 11:53:57 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net-next v3 0/7] mptcp: out-of-order queue pruning To: "Matthieu Baerts (NGI0)" , Mat Martineau , Geliang Tang , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Simon Horman Cc: netdev@vger.kernel.org, mptcp@lists.linux.dev, linux-kernel@vger.kernel.org, Gang Yan References: <20260807-net-next-mptcp-oooq-pruning-v3-0-dbc1eb853cc3@kernel.org> From: Paolo Abeni Content-Language: en-US In-Reply-To: <20260807-net-next-mptcp-oooq-pruning-v3-0-dbc1eb853cc3@kernel.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 8/7/26 3:49 PM, Matthieu Baerts (NGI0) wrote: > Under memory pressure, a pruning of the MPTCP-level OoO queue might be > required as last resort, to avoid too long recoveries, or even stalls. > Geliang and Gang managed to reproduce this behaviour, and Paolo > improved the situation thanks to the following patches: > > - Patches 1-3: improve the MPTCP-level retransmission schema to make > recoveries from memory pressure/after MPTCP-level drop significantly > faster. > > - Patches 4-5: make the admission check way stricter for incoming > packets exceeding the memory limits, with some exceptions for fallback > sockets. > > - Patches 6-7: implement OoO queue pruning for MPTCP. > > Signed-off-by: Matthieu Baerts (NGI0) Sashiko has a few comments on this series, but IMHO only patches 2 and 7 really need some adjustment, and changes there (fix the stale/retrans race, wrong unlikely, and too early OoO prune) should be handled as follow-ups. /P