From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: <thomas@monjalon.net> Received: from out1-smtp.messagingengine.com (out1-smtp.messagingengine.com [66.111.4.25]) by dpdk.org (Postfix) with ESMTP id 2319EFFA for <dev@dpdk.org>; Tue, 12 Sep 2017 22:14:05 +0200 (CEST) Received: from compute1.internal (compute1.nyi.internal [10.202.2.41]) by mailout.nyi.internal (Postfix) with ESMTP id B858A20E46; Tue, 12 Sep 2017 16:14:04 -0400 (EDT) Received: from frontend1 ([10.202.2.160]) by compute1.internal (MEProxy); Tue, 12 Sep 2017 16:14:04 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=monjalon.net; h= cc:content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to:x-me-sender :x-me-sender:x-sasl-enc:x-sasl-enc; s=mesmtp; bh=dSlmzwuOKRAo6YB ewDkEImEC81EMPQ5S12P7yuVZ1LI=; b=N2Gx9Om3t8XY6QBuRo6ICivJD+b2WlK CqzDTo1c0EB12CzoUvOTpZUT+9W2Gj+kcMXFsIMW39fUL7AxUDrXoTpjBhNnKQ0T DferYZ2v2m7F2qF++1BV5hhUHVUwq3Ul9Ml/o3RFUSuwFnCz7FZt1PWpoLoGmNCU H0SYRUii1zac= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:content-transfer-encoding:content-type :date:from:in-reply-to:message-id:mime-version:references :subject:to:x-me-sender:x-me-sender:x-sasl-enc:x-sasl-enc; s= fm1; bh=dSlmzwuOKRAo6YBewDkEImEC81EMPQ5S12P7yuVZ1LI=; b=NIT5cneR UhYOBwsAzXWIW674bnxRsGxDwU9j5UfrEUuec1fr3j9BeKwB8BTXk+Ax9AJyeg/L T70aq0napYDiyNhf4/o0I+/MP+BZhwLx4xePAPJzdRrC2dxIReU4hb9DFiIsJiqW ac3FivMmr5DfrB7+KcUL8nRVYgb3+gS7mqa20qtxQF3kqwsnSpf/NyBmz3y7yhM0 sOF/1TUhl0gu+zf0/VWurThXE/eIHy8Rrm9V/QegrzsPtMrzsV4SXDD2yg49AlNZ QqK4kKWnJ1Qx2Uw11bxxVcI5/Nbm0VxoevyXaPjDGE5LpjMi+846e06dOOaoo2n4 Wj3hJl0kg8Gd3w== X-ME-Sender: <xms:DEC4WUEd-korNtEqd6-v5FhSNI70TnjB941jm133MjUFU38NejIdeg> X-Sasl-enc: 8xz8h8Yc4LAsWe6C3gvwYIrb8/T6rKfhRFjm2ROM3d1Y 1505247244 Received: from xps.localnet (184.203.134.77.rev.sfr.net [77.134.203.184]) by mail.messagingengine.com (Postfix) with ESMTPA id 6D3D87E8EE; Tue, 12 Sep 2017 16:14:04 -0400 (EDT) From: Thomas Monjalon <thomas@monjalon.net> To: Aaron Conole <aconole@redhat.com>, Eelco Chaudron <echaudro@redhat.com> Cc: dev@dpdk.org, jingjing.wu@intel.com, john.mcnamara@intel.com Date: Tue, 12 Sep 2017 22:14:01 +0200 Message-ID: <1863612.973jloI4LL@xps> In-Reply-To: <f7to9qgynql.fsf@dhcp-25-97.bos.redhat.com> References: <22990026376b08418cb0eb6f028840c03e89f47f.1505221429.git.echaudro@redhat.com> <f7to9qgynql.fsf@dhcp-25-97.bos.redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" 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 <dev.dpdk.org> List-Unsubscribe: <http://dpdk.org/ml/options/dev>, <mailto:dev-request@dpdk.org?subject=unsubscribe> List-Archive: <http://dpdk.org/ml/archives/dev/> List-Post: <mailto:dev@dpdk.org> List-Help: <mailto:dev-request@dpdk.org?subject=help> List-Subscribe: <http://dpdk.org/ml/listinfo/dev>, <mailto:dev-request@dpdk.org?subject=subscribe> X-List-Received-Date: Tue, 12 Sep 2017 20:14:05 -0000 12/09/2017 16:50, Aaron Conole: > Eelco Chaudron <echaudro@redhat.com> 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 <echaudro@redhat.com> > > Acked-by: Aaron Conole <aconole@redhat.com> It is interesting, but why make it in testpmd? Maybe it should be documented in this guide: http://dpdk.org/doc/guides/linux_gsg/nic_perf_intel_platform.html