From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wi0-f170.google.com (mail-wi0-f170.google.com [209.85.212.170]) by dpdk.org (Postfix) with ESMTP id 98AE3B373 for ; Thu, 28 Aug 2014 11:02:05 +0200 (CEST) Received: by mail-wi0-f170.google.com with SMTP id cc10so200505wib.5 for ; Thu, 28 Aug 2014 02:06:13 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:organization :user-agent:in-reply-to:references:mime-version :content-transfer-encoding:content-type; bh=bulFtyquERGk51fqfHhQkehPsheU/79cQuq3L1q9Xgs=; b=aCfq4O47jQJiCV64oH6EJVaiJH2EGNhvQWH5Bk1gtHdl7Ye7yPiv/zsDqALVa/S22L xuXu44xOMVzsd8ZvrU1jeBfQji+i1qcB4ZvWGV247BXhGsUsQV+qnZNoqDiVaWlMapjD aWUSvM7SIUNGGN5LFItinKXUSJJbVsXOJUcXRlbs4SBh4ON2BDvdrV5rgK654JufRf/L 5eM84zQYsQeu4N3KBgMTTcjmXUxnnPiqu+8b5KX7LNvu+vbj1ZRjLiY1SWwDq4Al95uz WDN1W/aCjXUS1kaKGiHlBZZqGiyQ8SAeJn+1mpUdfdNlmxXpa0/8cySnfwT4LxefZd7b xX5w== X-Gm-Message-State: ALoCoQnjepovfmLOA3GM7+tMkFRd1UcarZrJRYqddQeR4L/b9mbxbSRS2UPlR4wDzBdBPjv8fChq X-Received: by 10.180.19.10 with SMTP id a10mr10372871wie.49.1409216773671; Thu, 28 Aug 2014 02:06:13 -0700 (PDT) Received: from xps13.localnet (guy78-3-82-239-227-177.fbx.proxad.net. [82.239.227.177]) by mx.google.com with ESMTPSA id z8sm33291211wiv.24.2014.08.28.02.06.12 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 28 Aug 2014 02:06:12 -0700 (PDT) From: Thomas Monjalon To: "Richardson, Bruce" Date: Thu, 28 Aug 2014 11:06:07 +0200 Message-ID: <2353283.PtiVvKdYNr@xps13> Organization: 6WIND User-Agent: KMail/4.13.3 (Linux/3.15.8-1-ARCH; KDE/4.13.3; x86_64; ; ) In-Reply-To: <59AF69C657FD0841A61C55336867B5B0343ECAF0@IRSMSX103.ger.corp.intel.com> References: <1598074.SMl35i2x6y@xps13> <53FE0FA5.8020900@tilera.com> <59AF69C657FD0841A61C55336867B5B0343ECAF0@IRSMSX103.ger.corp.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" Cc: dev@dpdk.org Subject: Re: [dpdk-dev] next releases X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 28 Aug 2014 09:02:05 -0000 2014-08-28 08:41, Richardson, Bruce: > As for rte_rdtsc_precise, I'm not sure about its origins, but I'm > surprised to see that it does not correspond to the rdtscp instruction. > Can anyone else comment on this one? I would assume it's designed > to be used to get more accurate measurements of smaller blocks of > code that we want to benchmark, since rdtsc works best when timing > larger blocks (in terms of cycle counts, that is, not source lines :-) ). The good thing with git history (and well written commit logs) is that we can easily get such answer: http://dpdk.org/browse/dpdk/commit/?id=3314648f83c3dc06d7d9a Bruce, do you know how rdtscp is supported across Intel processors? -- Thomas