From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S966159AbXDCKvY (ORCPT ); Tue, 3 Apr 2007 06:51:24 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S966160AbXDCKvY (ORCPT ); Tue, 3 Apr 2007 06:51:24 -0400 Received: from wr-out-0506.google.com ([64.233.184.226]:59618 "EHLO wr-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S966159AbXDCKvX (ORCPT ); Tue, 3 Apr 2007 06:51:23 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:cc:mime-version:content-type; b=rcJrMtxGrCCfoqLFqmz1KZzvLl88KB0xNpA9CGyXWHNXBcaXdyG34SLF8d6OThWO8n3eOwepFecT5AyKc2KJMfSpuwRLxGbMf36hEzvZMoYXcsFXQXFVHDjqHPbR9kgN/0KDzUh/3lxpXGklSdJBfK4v9wN36MK0CGWJ0T7I720= Message-ID: <88df6dda0704030351u44fab6bcj20f9b48d24de861a@mail.gmail.com> Date: Tue, 3 Apr 2007 16:21:21 +0530 From: "Ameya Mitragotri" To: linux-kernel@vger.kernel.org Subject: fadvise+sync_file_range Vs O_DIRECT Cc: suparna@in.ibm.com, pbadari@gmail.com MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_6167_12724477.1175597481625" Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org ------=_Part_6167_12724477.1175597481625 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline Hello, I am doing some benchmarking on writes to the hdd from a simple application (attached). Im benchmarking the writes using the following - write with O_DIRECT - write with fadvise + O_SYNC - write with fadvise + sync_file_range Ive tested the writes in chunks of 4/8/16 KB and 1MB The results show fadvise + sync_file_range is on par or better than O_DIRECT. Detailed results are attached. Now are these results along the expected lines? AFAIK O_DIRECT should be faster because it bypasses the cache. Does it make sense for apps to use fadvise + sync_file_range rather than use O_DIRECT? I havent tried benchmarking using tools like Iozone as yet. Hardware/OS details 1) AMD Athlon with 512 MB RAM running plain vanilla 2.6.20 (ext3 partition) 2) Intel P4 with 512 MB RAM running plain vanilla 2.6.20 (ext3 partition) Thanks Ameya ------=_Part_6167_12724477.1175597481625 Content-Type: application/x-gzip; name=appl.tar.gz Content-Transfer-Encoding: base64 X-Attachment-Id: f_f0287c7b Content-Disposition: attachment; filename="appl.tar.gz" H4sIACXjEUYAA+1cDXAcxZXuXa1t7SKw/AM4ieuYMnIsgbzeXa1+wDYlWRojg7CNLBtTFozW+6Pd sNrd7M6ClEPEZu1DG9kJFZIK3vIRCKRyP+Tiu0quSCXFYexCkOMon891MTknKBUlJx+6K1FHjhQI dO9198z0jlaSubPNT+a5enu+7tfdr3u6e970fHJLKrWOXGLxgDTW17O4wV8UcyFeT4PHX9fg8TXW EQ8AXyOR6i+1YSjZjBpISxJJhzN9sTn05sv/hEoL3H81nFGVZCiWDgfVS9HG3PffW9dQ18Dvf73f 68f7X+cDdclzKYwxyx/5/f+y3LHZZrPp2E7KCKKeA45yP8QdV7B0P5HIIlJNVpLPkIUUQ9gHOhBG 4RrDAggOCGUQlkMly/c7yjEsA7yM59l4oAJlMTSVE4IBy5NKlk/THoc8CFWQ0ARhIc+3o12Q3wF5 GF4GjGEhbwNDNehXQ9sYJMCSkHfnb9VQqbHQyq+Lx/aui4fWxmOJbL87k3T7WHolt/3WrTv5WLEy 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