From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pg1-f171.google.com (mail-pg1-f171.google.com [209.85.215.171]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 843A63502BF for ; Fri, 31 Oct 2025 18:01:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.171 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761933699; cv=none; b=ZO6gPihL/3TKbmJcFkqU+uVFyAdcJ94FvWLCn8vptJbgc2bc8ezXC1DK1/aPvbcBodx1xaqdVDbOvLTBrK+B2sRsJyGDBxJ0bYj2MxylXaYjsIVliF7FQHm0m0nZrNEp6aX0lxjvHg9jg8FEmWkPzx0FuNi73IHW+xPMvouaYV4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761933699; c=relaxed/simple; bh=81+nJ650azoIXDBc6RcFb6YDuiULytfHKOAtUCKouK4=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=sjvz76jedarqtqcYACRk9qZGCx2HA7mlg/N3bRM6uVKp18pV/rB6cdJ+fX1XH1TB2XXps8WvBqRW8sunfT+XKlq/I1h38r0lVd0Ks6xhmtbjDDNqffZfG0mFtEy2xYNKxDPTztmlLGu2yhRwBCaKBU4mR6AyQZMM3VgA6iQb2G0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=networkplumber.org; spf=pass smtp.mailfrom=networkplumber.org; dkim=pass (2048-bit key) header.d=networkplumber-org.20230601.gappssmtp.com header.i=@networkplumber-org.20230601.gappssmtp.com header.b=s7BzkPma; arc=none smtp.client-ip=209.85.215.171 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=networkplumber.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=networkplumber.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=networkplumber-org.20230601.gappssmtp.com header.i=@networkplumber-org.20230601.gappssmtp.com header.b="s7BzkPma" Received: by mail-pg1-f171.google.com with SMTP id 41be03b00d2f7-b6ce806af3eso2506395a12.0 for ; Fri, 31 Oct 2025 11:01:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=networkplumber-org.20230601.gappssmtp.com; s=20230601; t=1761933697; x=1762538497; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:subject:cc:to:from:date:from:to:cc:subject:date :message-id:reply-to; bh=virWIerUx49P6zwM9hCjO2u0AG9r9qg+xRXO7tQjwas=; b=s7BzkPmacwRMLjit3NFkO4A8WjrTbk+xNXWZm74IjJ6JS/z1rAEVygdLp8tcdI9v31 ftEBVhHqXhze9SvtFdDbwXXOkFdYYSjJNfFEKMSMs1945033P7dCuYZlyuE+u9CXlRe0 ZJ65v17pU/9ywT9tRgfOz0xLhxgnbI4g0stCLF0gfP4ehqd8NEJIWTcp+XWmP5xGXXpv 57+MtccO4V33a91ZLReDG+8A8mJGw0KnqvcFulFuGB24xkJkYK0Ujt/hZ3+Qv0us98v9 TLhkLGMawxwz7pi03yjI6Z012KZd9zqIvIhGNkk3ZicZ57+9dEMHOBcVXdqcEPwZCKHF cT+w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1761933697; x=1762538497; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:subject:cc:to:from:date:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=virWIerUx49P6zwM9hCjO2u0AG9r9qg+xRXO7tQjwas=; b=IV3gR03YnpJeKnq48tQo0fej2ltNmvJpc5bpi8kX7tcEYhsJpmDo5MrQIxFRg6LqKU ywg8xgZz75YSn4Rp9HmnpYcN4UQQDdbOUkkVOGEG/0+E5FRrlLCZwcuJ/QdWkI2b47ji E4LHq2b+dwIszc4kFri1lqA/OOYo+6iRHHYlhxQbR9c3GHpri/mlDHYO+yL4KucDxEyg VaCTej/U3VzlATKxppUcO75rf2hAYlkt7Zduk5ddRI5EnBppqJtFRA/v7vHlOzaHY9u5 xZ95UPlpz8sfL0RrJYULWVPI0h4YUHJjBPUkPgRIDMuhnCEvrYvGmHo93+drodmgNIpj 6qeg== X-Forwarded-Encrypted: i=1; AJvYcCWT9JzfZcCeNpFY8Ev5yCw6gvn10xR06QTXk8GZKqiPu22wRi0iTzALyHYglcJ36P9UAiXOGW0=@vger.kernel.org X-Gm-Message-State: AOJu0YyVkDlcqpRcpaFlXIBTXvwwiyRWssWRJnPAoNdGnt5ZRLRkeJOb Kb41qSjynSj4/Z7at4MRQElzPR7ofFcSPpLm4w6FWpZooeQ02hzzfpsZ9j56WmrA8LQ= X-Gm-Gg: ASbGncujkA9T6Z9BBwRmDWSiB9EgGU3TLdy90T6Y7gC+Xm2fGFhkL5vDT0GAvRVskCB LTwwCSW2Z2sP7oxIQWvIZe4qllvSJRn7tiHW+uz7l3qWJymF6k7tgKVfwYkp72EgdUS4mfYo+8u smSTCQTUkdloFR643At7UEsYlDI2oZ9crq6Lnk75IOVPoquuevubhe0rT5sQTOaf3WiucgLeUBy IN1uvwIQfDU7ovITf+OZKj7TXW14phm4vu9HCcj2RRXavvnD6Le3cZMoLHPq5scPLEG4CwM/uOW kdJZW/0YlcReFbdSg2UZdN1N40lVJzXEeArf9rUGPSeVKONHF5X+4HwPbmi98b7Fs/XF2sU2Fmj k2n9YYaPh7SGILCh4YgLo7tQ4zA0drg2gpksCB2C8592X2fiERZq1t8W821QQrrYLhsspnUzM1N GzrUrdgXQar1Kry61aJViMAh0oHS3w8abBvA== X-Google-Smtp-Source: AGHT+IGLscsEnHzdJ0wSF1z/pg6r+/MX7xr+3OX5V0qn3x0wM3NQrWp77SgBn0CVsTBJv7XWMAUWpA== X-Received: by 2002:a17:902:e74e:b0:294:9476:494a with SMTP id d9443c01a7336-2951a533f8dmr53661025ad.56.1761933696540; Fri, 31 Oct 2025 11:01:36 -0700 (PDT) Received: from phoenix (204-195-96-226.wavecable.com. [204.195.96.226]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-29551168756sm2955035ad.16.2025.10.31.11.01.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 31 Oct 2025 11:01:36 -0700 (PDT) Date: Fri, 31 Oct 2025 11:01:33 -0700 From: Stephen Hemminger To: Christoph Schwarz Cc: Eric Dumazet , Neal Cardwell , netdev@vger.kernel.org Subject: Re: TCP sender stuck despite receiving ACKs from the peer Message-ID: <20251031110133.3d469992@phoenix> In-Reply-To: References: Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Fri, 31 Oct 2025 10:43:36 -0700 Christoph Schwarz wrote: > The "parent" device is served by a proprietary device driver for a > switch ASIC, and implements TX flow control, with the TX queue being > stopped frequently. It does not have TSO capabilities. We could look > into adding that, but as of now it is not an option. You really should not expect any on mailing list support for anything that uses proprietary device driver. I.e "not my problem go away"