From mboxrd@z Thu Jan 1 00:00:00 1970 From: Maxime Coquelin Subject: Re: [PATCH] app/testpmd: adds mlockall() to fix pages Date: Wed, 13 Sep 2017 11:15:18 +0200 Message-ID: <6e9f3c2e-a2d8-54ba-f52e-3cc87de03f16@redhat.com> References: <22990026376b08418cb0eb6f028840c03e89f47f.1505221429.git.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: Eelco Chaudron , 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 538F57CBD for ; Wed, 13 Sep 2017 11:15:24 +0200 (CEST) In-Reply-To: <22990026376b08418cb0eb6f028840c03e89f47f.1505221429.git.echaudro@redhat.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 09/12/2017 03:08 PM, 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 > --- > app/test-pmd/testpmd.c | 3 +++ > 1 file changed, 3 insertions(+) > Acked-by: Maxime Coquelin Thanks, Maxime