From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by dpdk.org (Postfix) with ESMTP id DE633F04 for ; Tue, 12 Sep 2017 16:51:00 +0200 (CEST) Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 3F55D883B0; Tue, 12 Sep 2017 14:51:00 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 3F55D883B0 Authentication-Results: ext-mx02.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx02.extmail.prod.ext.phx2.redhat.com; spf=fail smtp.mailfrom=aconole@redhat.com Received: from dhcp-25-97.bos.redhat.com (unknown [10.18.25.172]) by smtp.corp.redhat.com (Postfix) with ESMTPS id C076317DF6; Tue, 12 Sep 2017 14:50:59 +0000 (UTC) From: Aaron Conole To: Eelco Chaudron Cc: jingjing.wu@intel.com, dev@dpdk.org References: <22990026376b08418cb0eb6f028840c03e89f47f.1505221429.git.echaudro@redhat.com> Date: Tue, 12 Sep 2017 10:50:58 -0400 In-Reply-To: <22990026376b08418cb0eb6f028840c03e89f47f.1505221429.git.echaudro@redhat.com> (Eelco Chaudron's message of "Tue, 12 Sep 2017 15:08:44 +0200") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.0.50 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.26]); Tue, 12 Sep 2017 14:51:00 +0000 (UTC) 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: Tue, 12 Sep 2017 14:51:02 -0000 Eelco Chaudron writes: > 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 > --- Acked-by: Aaron Conole