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[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-kernel@vger.kernel.org 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