From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by dpdk.org (Postfix) with ESMTP id 1975E201 for ; Thu, 6 Apr 2017 11:54:58 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=intel.com; i=@intel.com; q=dns/txt; s=intel; t=1491472499; x=1523008499; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=kK5DEDGGgMExjOJhEiX91DLAQArCcR7bd2fCaLDH8js=; b=WnW3BYewEo6OcFCWrue5N4VzF23g2BbPETR49iZVWGGSPlykJWp87Xb3 9A/nGtMMct0sqkVIuztOpz5EuYxGwA==; Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 06 Apr 2017 02:54:58 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.37,159,1488873600"; d="scan'208";a="245025913" Received: from bricha3-mobl3.ger.corp.intel.com ([10.237.221.140]) by fmsmga004.fm.intel.com with SMTP; 06 Apr 2017 02:54:55 -0700 Received: by (sSMTP sendmail emulation); Thu, 06 Apr 2017 10:54:54 +0100 Date: Thu, 6 Apr 2017 10:54:54 +0100 From: Bruce Richardson To: Vladyslav Buslov Cc: Ferruh Yigit , "Pei, Yulong" , "Zhang, Helin" , "Wu, Jingjing" , "dev@dpdk.org" , Nitin Kumar Message-ID: <20170406095454.GB3564@bricha3-MOBL3.ger.corp.intel.com> References: <1488365813-12442-1-git-send-email-vladyslav.buslov@harmonicinc.com> <188971FCDA171749BED5DA74ABF3E6F03B6ACF0D@shsmsx102.ccr.corp.intel.com> <2c220d4f-b8c5-1824-c8cd-69f20c6ce04f@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Organization: Intel Research and =?iso-8859-1?Q?De=ACvel?= =?iso-8859-1?Q?opment?= Ireland Ltd. User-Agent: Mutt/1.8.0 (2017-02-23) Subject: Re: [dpdk-dev] [PATCH] net/i40e: add packet prefetch 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: Thu, 06 Apr 2017 09:54:59 -0000 On Thu, Apr 06, 2017 at 09:29:12AM +0000, Vladyslav Buslov wrote: > Ferruh, > > In our case patch significantly improves application performance. (~40% more PPS on load balancer core) > Using DPDK examples I can only reproduce perf improvements with similar design apps like load_balancer. > With applications that send on free packets on same core where they are received performance is not improved. > > It seems that this patch doesn't do anything(or even actually slightly degrades performance) for run-to-completion apps so we will have to continue maintaining it as part part of our internal branch. > > Regards, > Vlad > Is it possible to get the same performance boost in your app, while avoiding the perf hit in run-to-completion apps, by using a runtime, rather than compile-time option? /Bruce