From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eelco Chaudron Subject: Re: [PATCH] app/testpmd: adds mlockall() to fix pages Date: Fri, 29 Sep 2017 10:15:19 +0200 Message-ID: <2915a386-08ad-ca2e-4b33-2c001ec6c7dc@redhat.com> References: <22990026376b08418cb0eb6f028840c03e89f47f.1505221429.git.echaudro@redhat.com> <7ca2adec-cb72-ea15-8c4b-ae33b8889036@intel.com> Reply-To: echaudro@redhat.com Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Cc: dev@dpdk.org To: Sergio Gonzalez Monroy , jingjing.wu@intel.com Return-path: Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by dpdk.org (Postfix) with ESMTP id 735111B1A6 for ; Fri, 29 Sep 2017 10:14:59 +0200 (CEST) In-Reply-To: <7ca2adec-cb72-ea15-8c4b-ae33b8889036@intel.com> Content-Language: en-US List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" On 29/09/17 10:07, Sergio Gonzalez Monroy wrote: > On 12/09/2017 14:08, Eelco Chaudron wrote: >> Call the mlockall() function, to attempt to lock all of its process >> memory into physical RAM, and preventing the kernel from paging any >> of its memory to disk. >> >> When using testpmd for performance testing, depending on the code path >> taken, we see a couple of page faults in a row. These faults effect >> the overall drop-rate of testpmd. On Linux the mlockall() call will >> prefault all the pages of testpmd (and the DPDK libraries if linked >> dynamically), even without LD_BIND_NOW. >> >> Signed-off-by: Eelco Chaudron >> --- > > When used for performance testing using hugepages or --no-huge option? This is independent of huge pages, its for the text (code) sections.