From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga07.intel.com (mga07.intel.com [134.134.136.100]) by dpdk.org (Postfix) with ESMTP id 2A8F52C2E; Mon, 24 Apr 2017 15:04:15 +0200 (CEST) Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga105.jf.intel.com with ESMTP; 24 Apr 2017 06:04:14 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.37,244,1488873600"; d="scan'208";a="93093222" Received: from silpixa00381631.ir.intel.com (HELO silpixa00381631.ger.corp.intel.com) ([10.237.222.122]) by fmsmga005.fm.intel.com with ESMTP; 24 Apr 2017 06:04:12 -0700 From: Pablo de Lara To: dev@dpdk.org Cc: Bruce Richardson , stable@dpdk.org Date: Mon, 24 Apr 2017 14:04:22 +0100 Message-Id: <1493039062-153249-1-git-send-email-pablo.de.lara.guarch@intel.com> X-Mailer: git-send-email 2.7.4 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Subject: [dpdk-stable] [PATCH] examples/performance-thread: fix compilation on SuSE 11 SP2 X-BeenThere: stable@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches for DPDK stable branches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 24 Apr 2017 13:04:19 -0000 From: Bruce Richardson Fixes following compilation error, using uint64_t type, instead of int128_t unnecessarily: In file included from ./common/lthread.c:82:0: ./common/lthread_timer.h: In function ‘_ns_to_clks’: ./common/lthread_timer.h:49:20: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘clkns’ compilation terminated due to -Wfatal-errors. Fixes: 116819b9ed0d ("examples/performance-thread: add lthread subsystem") Cc: stable@dpdk.org Signed-off-by: Bruce Richardson Acked-by: Pablo de Lara --- examples/performance-thread/common/lthread_timer.h | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-) diff --git a/examples/performance-thread/common/lthread_timer.h b/examples/performance-thread/common/lthread_timer.h index b044b90..7c03d67 100644 --- a/examples/performance-thread/common/lthread_timer.h +++ b/examples/performance-thread/common/lthread_timer.h @@ -46,11 +46,22 @@ extern "C" { static inline uint64_t _ns_to_clks(uint64_t ns) { - unsigned __int128 clkns = rte_get_tsc_hz(); + /* + * clkns needs to be divided by 1E9 to get ns clocks. However, + * dividing by this first would lose a lot of accuracy. + * Dividing after a multiply by ns, could cause overflow of + * uint64_t if ns is about 5 seconds [if we assume a max tsc + * rate of 4GHz]. Therefore we first divide by 1E4, then + * multiply and finally divide by 1E5. This allows ns to be + * values many hours long, without overflow, while still keeping + * reasonable accuracy. + */ + uint64_t clkns = rte_get_tsc_hz() / 1e4; clkns *= ns; - clkns /= 1000000000; - return (uint64_t) clkns; + clkns /= 1e5; + + return clkns; } -- 2.7.4