From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_PASS,UNPARSEABLE_RELAY autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D7447C43444 for ; Tue, 15 Jan 2019 17:32:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A891620656 for ; Tue, 15 Jan 2019 17:32:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="484HcAMv" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730458AbfAORcO (ORCPT ); Tue, 15 Jan 2019 12:32:14 -0500 Received: from userp2120.oracle.com ([156.151.31.85]:42104 "EHLO userp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726022AbfAORcO (ORCPT ); Tue, 15 Jan 2019 12:32:14 -0500 Received: from pps.filterd (userp2120.oracle.com [127.0.0.1]) by userp2120.oracle.com (8.16.0.22/8.16.0.22) with SMTP id x0FHE0CW020845; Tue, 15 Jan 2019 17:32:04 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=to : cc : subject : from : references : date : in-reply-to : message-id : mime-version : content-type; s=corp-2018-07-02; bh=u0WE5hfj6ulueNXnNXvJ1h/hCVgbLZphc8ZAdhtDa+4=; b=484HcAMvzc/XB+7NjoS1WfwWRsvQY+OX+bekwzHcMlmSLgYRd5itdXZNcfJpZpJiX+7L dWmirobgCb+1FJalFboAS8cuqBVo2JlnVWnkjulQgXvGKB/9ucAWRaojjuo1cM7ZjMBf THHuqjMlHIVtM5dFBEU/gOe/ETbfcNO5WOfCKPfED5LT2/AVvIr9Y/Lf1FYQCTiRWmfe jxGj4gcw/6Ye2d6HVf/lQqNQRBNB8NqofKzmO95QkOEIbhinMoCd8e16Bmh/nKBaITI9 O5uYJYIBGq0eSTkVgwWii1yu4C/276PKM5l/4zUEPYthgf8c3RPttmkeiTXi/S5juMnP rg== Received: from aserv0021.oracle.com (aserv0021.oracle.com [141.146.126.233]) by userp2120.oracle.com with ESMTP id 2pybjs5900-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 15 Jan 2019 17:32:03 +0000 Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by aserv0021.oracle.com (8.14.4/8.14.4) with ESMTP id x0FHW2Ci025656 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 15 Jan 2019 17:32:03 GMT Received: from abhmp0002.oracle.com (abhmp0002.oracle.com [141.146.116.8]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id x0FHW2IE031843; Tue, 15 Jan 2019 17:32:02 GMT Received: from ca-mkp.ca.oracle.com (/10.159.214.123) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Tue, 15 Jan 2019 09:32:02 -0800 To: Jens Axboe Cc: "Martin K. Petersen" , linux-fsdevel@vger.kernel.org, linux-aio@kvack.org, linux-block@vger.kernel.org, linux-arch@vger.kernel.org, hch@lst.de, jmoyer@redhat.com, avi@scylladb.com Subject: Re: [PATCH 05/15] Add io_uring IO interface From: "Martin K. Petersen" Organization: Oracle Corporation References: <20190110024404.25372-1-axboe@kernel.dk> <20190110024404.25372-6-axboe@kernel.dk> <54976aac-bef2-880f-dc10-e3030189a08a@kernel.dk> Date: Tue, 15 Jan 2019 12:31:59 -0500 In-Reply-To: <54976aac-bef2-880f-dc10-e3030189a08a@kernel.dk> (Jens Axboe's message of "Sun, 13 Jan 2019 09:22:16 -0700") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9137 signatures=668682 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=676 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1901150143 Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Archived-At: List-Archive: List-Post: Jens, > I bit the bullet and bumped the size. 64 bytes is a nicer size in terms > of cachelines anyway, and I really doubt that 48 vs 64 bytes makes a > size consumption problem for anyone. > > The buf_index is only used for the fixed buffers, which means that we have > 16 bytes / 128 bits that we can grab for things like KV. Great! -- Martin K. Petersen Oracle Linux Engineering