From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 15D0E393DE6 for ; Mon, 20 Apr 2026 10:30:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776681005; cv=none; b=KV1vRov2ugY6S/SlD57UD8jVPPxB88JyMO4/ow45zl4sSW+iahlPzNQlOFnVcQf5b7CCdeK0aDYqy0iaJp6/pSed2aWv/94RyI/amWNhDLAHWobd0fVY9EuzExdRKoyk8cmyp8GwYd+jn4BxvtzIRtsPLxIra0QPA2TbA1Xro8w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776681005; c=relaxed/simple; bh=AoEnoDLqXbeFoQVhKOPgLTzlc8sLrUAoI7MwS0V/e5c=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:content-type; b=L4MLe3l1Ujjjs5csJWAMc6qLGSEz/+pJFfXTP+6VFHlRVHCIaNWUttN+d/zYoPHUbTMslDuoIKKtQVjzUXhvLJUKigrXarnSEcGG/BmRuYcP+TsWmhye9154I4P66MooL2c4AIsH5EyQjeNtPZiUN/dvZf4Psl/0zStzMUZmSRs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=baUM0N31; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="baUM0N31" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1776681003; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=7oOsBjoBRNUy1CHbditfQowtuA0dkjgUNA2sTaPBCow=; b=baUM0N31F7NlPPnU08S7btgtTM1eSAnp1KfRt2jfOwEaCGS1xdne9Amfwi6ZmAdItLIOpx KWeaFhhfaSBdApG2oJ7zh0gN0cLxKQIdQLoMtZwqWigEqc6U7umiAx9iSimqQIDM5zMjI+ p14lXxR4E5YnLW1EhANpskOHtY/ySds= Received: from mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-447-L6nR6ulANcaBqsxMfop0GQ-1; Mon, 20 Apr 2026 06:29:59 -0400 X-MC-Unique: L6nR6ulANcaBqsxMfop0GQ-1 X-Mimecast-MFC-AGG-ID: L6nR6ulANcaBqsxMfop0GQ_1776680998 Received: from mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.17]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 57957180049F; Mon, 20 Apr 2026 10:29:58 +0000 (UTC) Received: from gerbillo.redhat.com (unknown [10.44.33.233]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 79A07195608E; Mon, 20 Apr 2026 10:29:56 +0000 (UTC) From: Paolo Abeni To: mptcp@lists.linux.dev Cc: yangang@kylinos.cn, geliang@kernel.org, matttbe@kernel.org Subject: [RFC PATCH 0/6] mptcp: address stall under memory pressure Date: Mon, 20 Apr 2026 12:29:24 +0200 Message-ID: Precedence: bulk X-Mailing-List: mptcp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: kFbz_9IHO3R6vWWUqGdd6dmoF8SIPTNHiCZXBaDgmEk_1776680998 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit content-type: text/plain; charset="US-ASCII"; x-default=true This is a very early RFC to discuss a different approch to solve the data transfer stall reported by Geliang and Gang. There are a few open points documented into the individual patches, the goal here is describe with some detail the intended architecture. Note that the diffstat is biases by the quite large patch 2/6, which contains mechanical transformation of existing code; "real" changes are noticiable smaller. Paolo Abeni (6): mptcp: move checks vs rcvbuf size earlier in the RX path mptcp: sync mptcp skb cb layout with tcp one tcp: expose the tcp_collapse_ofo_queue() helper to mptcp usage, too mptcp: implemented OoO queue pruning mptcp: refine coalescing conditions mptcp: unclone skbs before coalescing them, when needed include/net/tcp.h | 4 ++ net/ipv4/tcp_input.c | 55 ++++++++++------ net/mptcp/mib.c | 3 + net/mptcp/mib.h | 3 + net/mptcp/options.c | 35 +++++++++- net/mptcp/protocol.c | 154 +++++++++++++++++++++++++++++++------------ net/mptcp/protocol.h | 7 +- 7 files changed, 195 insertions(+), 66 deletions(-) -- 2.53.0