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Thu, 13 Aug 2026 00:40:26 -0700 (PDT) From: Wang Zhan To: Jakub Kicinski Cc: Aaron Conole , Eelco Chaudron , Ilya Maximets , keyong.sun@smartx.com, netdev@vger.kernel.org, dev@openvswitch.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH net-next] openvswitch: enable ops lock for internal ports Date: Thu, 13 Aug 2026 15:40:07 +0800 Message-ID: <20260813074007.3669651-1-wang.zhan@smartx.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260812164156.6bde8f4e@kernel.org> References: <20260812123003.3634034-1-wang.zhan@smartx.com> <20260812164156.6bde8f4e@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit > Why are you sending this patch? Do you have an actual real life need > for unlocked get_drvinfo?? Yes. The use case is broader than unlocked get_drvinfo. We are trying to reduce cases where ovs-vswitchd gets blocked waiting for the global RTNL lock. In production we saw ovs-vswitchd repeatedly report "Unreasonably long" poll intervals. Tracing showed one OVS operation waiting about 500 ms for RTNL while node-exporter was collecting the speed of an mlx5 interface. The node-exporter process was CPU quota throttled, which stretched that RTNL hold time; mlx5 can make this easier to hit because some queries go through firmware/mailbox paths. netdev_linux_set_ol() is one OVS path that can take RTNL. With userspace-tso-enable, OVS uses this path to read ethtool feature information through ETHTOOL_GSSET_INFO, ETHTOOL_GSTRINGS and ETHTOOL_GFEATURES. For ovs-internal-port, these GET operations do not need RTNL, but currently take it because internal ports do not opt into per-device ops locking.