From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by dpdk.org (Postfix) with ESMTP id 9A8541B21D for ; Fri, 29 Sep 2017 11:27:46 +0200 (CEST) Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga102.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 29 Sep 2017 02:27:45 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.42,452,1500966000"; d="scan'208";a="1200365786" Received: from smonroyx-mobl.ger.corp.intel.com (HELO [10.252.24.5]) ([10.252.24.5]) by fmsmga001.fm.intel.com with ESMTP; 29 Sep 2017 02:27:43 -0700 To: echaudro@redhat.com, jingjing.wu@intel.com References: <22990026376b08418cb0eb6f028840c03e89f47f.1505221429.git.echaudro@redhat.com> <7ca2adec-cb72-ea15-8c4b-ae33b8889036@intel.com> <2915a386-08ad-ca2e-4b33-2c001ec6c7dc@redhat.com> Cc: dev@dpdk.org From: Sergio Gonzalez Monroy Message-ID: <00ad8865-a782-07cb-2ade-1cfec2cb456a@intel.com> Date: Fri, 29 Sep 2017 10:27:43 +0100 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.1.1 MIME-Version: 1.0 In-Reply-To: <2915a386-08ad-ca2e-4b33-2c001ec6c7dc@redhat.com> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [dpdk-dev] [PATCH] app/testpmd: adds mlockall() to fix pages X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 29 Sep 2017 09:27:47 -0000 On 29/09/2017 09:15, Eelco Chaudron wrote: > 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. Understood. Just for curiosity, how much drop-rate was observed? Thanks, Sergio