From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753776AbcFOVqn (ORCPT ); Wed, 15 Jun 2016 17:46:43 -0400 Received: from mout.gmx.net ([212.227.17.20]:54830 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753105AbcFOVqj (ORCPT ); Wed, 15 Jun 2016 17:46:39 -0400 To: Linux Kernel From: =?UTF-8?Q?Toralf_F=c3=b6rster?= Subject: Why are the MB/s of avx and raid6: twice as high for a docked ThinkPad than for an undocked ? Message-ID: <5761CCBA.7050405@gmx.de> Date: Wed, 15 Jun 2016 23:46:34 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.8.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-Provags-ID: V03:K0:uPeHCKV8CRX2SJ4TSryBsRgWRpvtp4NT3uRzwcjNwXG04lOOIXm 7KIRrBhmdwLl1x2Kfzhvbsaq75MP3XitCTymoMSJ0P5/1S4JPFmtmxyBrM18NPxzp6GC99W ZcVjzfjefeYxkF7IVKUedYR5GhVAxdVT1wYGXHs0/oj1jtCDnXDs6pol0Y79ELOWx/ubX1H /SuoHfF3TXH+Reb71NMnw== X-UI-Out-Filterresults: notjunk:1;V01:K0:vhbt+hq4rQA=:F/yquqH/rehHM3OQxMMBwk jkxdNnlLCujjoNtQWNKGKyuI0OoHztpr5yFfosxwSvqN//mIov6JQiQ2J+W2cPlmEekbkyPi7 4zlzWl7eTZ2nN+3QNtDOexKceOEIQba+C/8Pa3sxgiX8PWLn3nYrWzJlbA22N/siX/SSfxiP8 EnGCx6M/Whd6zARn+4KX5QTwkqV5ewbhz9JWWYddvXhDFbZpSyCSJkXXj2wC1bDftfSwPx/Lk lk4tGId/56Syd4H06/Jmn7+UifxhIsifasLj1siTZvrs/btkqDfYwbj+Y8VG/t1M9t4MZg6tQ FZ3YcTAqpA9Yab/kCwZ/FdWofUlhVBOOaNNNA6zyvKTm28SVXBTU2iYW/4UUdbdXRAJ/vL/nA p+1SmsS9QKQkIzbgnxtBfLxEU3uEz6JENkgpIr9HheKzv2Z3mCrKosGF64dyRjBAfoZ/Ri1Fy mA96mcdbHj1bsfIJSXEZ1/qdrfxMjdm6VW3Hvpaub65CmNv1a3Blp0PyRdsMZZucf2NzVh074 WX5sNTsd2R+Ra8+6U4fAjWjmUBgUDWbb1FqI6hKAPCaC3A40xd76WWDrwTtqTMBqCJO0rtwWj UJQSJyKVhN2husUuJJK9Adnfxn/OUBbs8s53CC8JFtrTUliJdiz4oDWDiOjUKGysi0VBPw5bG e2f0SVCgT+WDXCN2jmcu72cSy4uVtkck+zyOk8w+YmTtrzrZDhNOsZJrIhmTX5nyGHgAZ0rwa w4NEGWCjyO0mGMnl9X0FtbZJunbXBgPCt+Hf+3QX7e+tY5kQW6Bjw2tmkv0eF/+lLX6ORw3hy 4Ke4FQS Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This diff is reliable depending whether the T440s is docked (right) or not (left) : Linux t44 4.5.7-hardened-r2 #1 SMP Wed Jun 15 23:39:10 CEST 2016 x86_64 Intel(R) Core(TM) i5-4300U CPU @ 1.90GHz GenuineIntel GNU/Linux 215c215 < avx : 10196.000 MB/sec --- > avx : 23504.000 MB/sec 225,234c225,234 < raid6: sse2x1 gen() 2578 MB/s < raid6: sse2x1 xor() 2007 MB/s < raid6: sse2x2 gen() 3246 MB/s < raid6: sse2x2 xor() 2203 MB/s < raid6: sse2x4 gen() 3773 MB/s < raid6: sse2x4 xor() 2640 MB/s < raid6: avx2x1 gen() 5042 MB/s < raid6: avx2x2 gen() 5812 MB/s < raid6: avx2x4 gen() 6824 MB/s < raid6: using algorithm avx2x4 gen() 6824 MB/s --- > raid6: sse2x1 gen() 5816 MB/s > raid6: sse2x1 xor() 4515 MB/s > raid6: sse2x2 gen() 7261 MB/s > raid6: sse2x2 xor() 4968 MB/s > raid6: sse2x4 gen() 8511 MB/s > raid6: sse2x4 xor() 5916 MB/s > raid6: avx2x1 gen() 11378 MB/s > raid6: avx2x2 gen() 13117 MB/s > raid6: avx2x4 gen() 15398 MB/s > raid6: using algorithm avx2x4 gen() 15398 MB/s And why do the units differ (MB/sec versus MB/s) ? -- Toralf PGP: C4EACDDE 0076E94E, OTR: 420E74C8 30246EE7