From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752217AbeFEN5y (ORCPT ); Tue, 5 Jun 2018 09:57:54 -0400 Received: from mail-pl0-f42.google.com ([209.85.160.42]:45490 "EHLO mail-pl0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751603AbeFEN5w (ORCPT ); Tue, 5 Jun 2018 09:57:52 -0400 X-Google-Smtp-Source: ADUXVKI31r7ofLZF7ku5zuhCQ+u81XU5h9o99vES98cTPsy1uPPlGidYuSDLLLE9RNI4smqbRH8f9g== 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 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