From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm2-f13.google.com (mail-wm2-f13.google.com [74.125.225.141]) (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 A50B54DF4D5 for ; Wed, 30 Sep 2026 18:38:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.225.141 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790793525; cv=none; b=FeFPPUeBEMWYs5hHgzRAeRX8ICTujbio0m7Vko9B83UD4cUMHs95dyg4ljcK04NHyCRnc2+tuOK1GxqnQZz6YDh/LLLT6M7amxoingzdtOWJXArLMAM2SJJv0R62p9AJ63sKGTpWB0QngSVtTh07fZCLMFxX/5f1vykOCSkIOF0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790793525; c=relaxed/simple; bh=qIYeVUCO05ZbZhdAAAoZexxaRjrSKWkj1JQrUJwwZr8=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=d+thLkxxXZlhjQWMKKj1D7kjmiIZVJr1uQhMZFeNjhZApeCnpwAjwrpgQ5qTMgCdBgiK5O1EZAsdDn9ADNqLrrg/QA9S+MihdiP6rhWPwzkefIfIWj8lqOzngPzJ3z+20JGQxYsHtG6XCGsrubsHY8dDCwLjnCvgkOpXg4lssGg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=NmHj7Jwn; arc=none smtp.client-ip=74.125.225.141 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="NmHj7Jwn" Received: by mail-wm2-f13.google.com with SMTP id 5b1f17b1804b1-49e7d2bb404so9717005e9.1 for ; Wed, 30 Sep 2026 11:38:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1790793522; x=1791398322; darn=lists.linux.dev; h=in-reply-to:content-disposition:content-type:mime-version :references:message-id:subject:cc:to:from:date:from:to:cc:subject :date:message-id:reply-to:content-type; bh=X/kW+42sSDWDUbw6VMWjlova15EUzqflh+DF1qz2pHg=; b=NmHj7Jwn2/pQdWScnlxY+p6xRE/jugG41XByf1vDN2+rTY69gc6Mqf8ZrEopYZGCn0 pnlACQrdf8R59HwAfbZizqKtVBhgBIXENhIILBygJ7HjSJnL4u4jZ6iI7QuXE8PjnTZl JamMB73NhNvB4u1bGjz/dxAgW6AhA19aYtR5plKXYYm59mgCnLB3gWaLKp/kp8XoaUX5 CJYEv8ppeu4qZAexvQP0BTciXlRpFf0ABj3oGABvGrNNrH+2SJu5b3euK3WuVJvDJDZL bd6Ckn/1yw5c5KVv4mYw0uHRW0J8/SSIA9az4hl3kJoohiNJv6KfnbD4H8rJoLJ9hk/k AiuQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1790793522; x=1791398322; h=in-reply-to:content-disposition:content-type:mime-version :references:message-id:subject:cc:to:from:date:x-gm-gg :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=X/kW+42sSDWDUbw6VMWjlova15EUzqflh+DF1qz2pHg=; b=YES4cmwGt/NtbfcvsA07k054RLq6wxQbN7DhCLEO5D0/tPgA1iukA5Va0pRu6FnTQt iZXHz5kKXlTyxZj0fO1Hg5JtbObbYD+SZU4R/iCCGZJU6vmtkq15pa9k1tYydWZ1AsaC 7sP1mia52SJVhMu6//t+VhBj2H037myO4ovQpRzVyOU0EM7apwQUc7PJUloFYsakVLO0 LRSWcooUd/rpL0Gf9DAEqP6Zu9JJUOo9IsKVJPKyESFJlRf619IuqJaTsKhE69OmX0zz rky6iG6Qbie3EnxWFCA9IbFSUe0a5UCVFxac7DyavRKU7gp8SJSg7+kL87SHDLoHt8K1 R3yw== X-Forwarded-Encrypted: i=1; AKwUvBwdAH52w7qBwVYnaIczsh2DG4EABwra3uIp/ZGxfqRxiqJnJNrvhIvJVXkDh0KOR1fxW7uG5ezS+o6CxkvXog==@lists.linux.dev X-Gm-Message-State: AFuF++neVzcH1BADZyh4Fqwh++W+StpcLcDf8wd3OWyxFAM7veQSEPAK KI8eW11I4lAp2fZDxLRKSr7XHKhZVxhOb9i6x81Hd/iYv4dvBSYIQv8N X-Gm-Gg: AYBFou3Ed4tuW5cypPnBFdUO0SIAjwtIod0RaWR5vn/B1XXn+QRq0vPW8/ditdq+8Q0 JvXxKvxyDBHfXsbVD4Vkt2FZaYQc0k/9hEVWvZTrYEEtQscNe2hjvhO7V5E4HvoPiHy3rikSi3f N6xWWr+w53OQ5DaF18BgeJeaUtUrwDmcceCpKfb9CAZGiVlnOYdVzjlZ7EobpfCrZkYRL/yVrba uxutFWlL1JtiKMo+LA9n1/yf/DcB4gO7KkoSItzAA7W+t9CXMX2IsBV7rc24hsx7AsOTbWsGO78 SJb94CI5whFFZdegbeXIjcG2UtwOY1G6iwc8CKf6tlT/ZzXMIMuvyOp6CRWk0UixVXA/EJ7A0tr L+EoNTxc2hwCXW7d45S9BULYsFIXqKgrfC20cXoi26DLDFUgao6w2sDbQ9DSh8GE/bzje8lh3eP pBd6PYE3iqSvB9MVL/M9uG1SI5QZCNXEYcn/Sl8Au6wki7o9aKhn5IUMy316uRt88wI0mUVBH1p 4vgVRv2E7l28HvWEq0C+ZMzv8owtU4f4Epc5Txyy+4PegcxGyZEFhlKv/1xZAm1pjaJgktYGIDb GCVZDSzV1vCfgA0lNfMJ4qXs1BLg0Ree56vi/lk1CYsp2QYP+mZwTF7cfqvPgZhjIqngSlsAcQ= = X-Received: by 2002:a7b:ca5a:0:b0:49f:fbad:29ae with SMTP id 5b1f17b1804b1-4a01eb19ffdmr6267285e9.17.1790793521692; Wed, 30 Sep 2026 11:38:41 -0700 (PDT) Received: from unknown748F3CBA5068 (dynamic-2a02-3100-b2b3-0101-b51c-a607-3dcc-3979.310.pool.telefonica.de. [2a02:3100:b2b3:101:b51c:a607:3dcc:3979]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4a01f979bbcsm1867795e9.5.2026.09.30.11.38.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 30 Sep 2026 11:38:41 -0700 (PDT) Date: Wed, 30 Sep 2026 20:38:39 +0200 From: Karl Mehltretter To: sashiko-reviews@lists.linux.dev Cc: linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev, netdev@vger.kernel.org, sashiko-bot@kernel.org, "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Sebastian Andrzej Siewior , Clark Williams , Steven Rostedt , Stephen Hemminger Subject: Re: [PATCH net 2/2] netpoll: avoid blocking on the transmit lock in queue_process Message-ID: References: <20260928064239.32456-1-kmehltretter@gmail.com> <20260928064239.32456-3-kmehltretter@gmail.com> <20260929064307.569CE1F000FF@smtp.kernel.org> Precedence: bulk X-Mailing-List: linux-rt-devel@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260929064307.569CE1F000FF@smtp.kernel.org> On Tue, Sep 29, 2026 at 06:43:06AM +0100, sashiko-bot@kernel.org wrote: > > + schedule_delayed_work(&npinfo->tx_work, HZ / 10); > > + return; > > [Severity: High] > Does this schedule an excessively long delay when encountering a transient > spinlock contention? Yes, HZ / 10 is too long for transient TX-lock contention. I've changed it in v2 to retry after one jiffy. The existing HZ / 10 backoff remains for a stopped transmit queue or NETDEV_TX_BUSY. Karl