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[24.4.232.150]) by smtp.gmail.com with ESMTPSA id p1-v6sm86013705pfp.137.2018.06.05.06.57.50 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 05 Jun 2018 06:57:51 -0700 (PDT) Date: Tue, 5 Jun 2018 06:57:49 -0700 From: Richard Cochran To: "Y.b. Lu" Cc: "netdev@vger.kernel.org" , Madalin-cristian Bucur , Rob Herring , Shawn Guo , "David S . Miller" , "devicetree@vger.kernel.org" , "linuxppc-dev@lists.ozlabs.org" , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH 09/10] dpaa_eth: add support for hardware timestamping Message-ID: <20180605135748.mlarwiyzf2oe27ax@localhost> References: <20180604070837.19265-1-yangbo.lu@nxp.com> <20180604070837.19265-10-yangbo.lu@nxp.com> <20180604134920.ezhe6jz5ntpnqyzj@localhost> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: NeoMutt/20170113 (1.7.2) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jun 05, 2018 at 03:35:28AM +0000, Y.b. Lu wrote: > [Y.b. Lu] Actually these timestamping codes affected DPAA networking performance in our previous performance test. > That's why we used ifdef for it. How much does time stamping hurt performance? If the time stamping is compiled in but not enabled at run time, does it still affect performace? Thanks, Richard