From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on archive.lwn.net X-Spam-Level: X-Spam-Status: No, score=-5.8 required=5.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI,SPF_HELO_NONE,SPF_NONE, UNPARSEABLE_RELAY autolearn=ham autolearn_force=no version=3.4.2 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by archive.lwn.net (Postfix) with ESMTP id 380F77D910 for ; Sun, 23 Jun 2019 00:41:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726373AbfFWAla (ORCPT ); Sat, 22 Jun 2019 20:41:30 -0400 Received: from userp2130.oracle.com ([156.151.31.86]:57856 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725844AbfFWAla (ORCPT ); Sat, 22 Jun 2019 20:41:30 -0400 Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x5N0fN4F137368; Sun, 23 Jun 2019 00:41:23 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=J+z+M4DxF8VeiH/SFm0jJi7hUA1gtP2EOoXI6xVLPGQ=; b=qGH0WBAr0WvtrXmJgAbrSjGmz2SbYYAoVdsDmn4NlazAoKO0qSGVZB5MzTRwo6eCmNHu F8fstYecG/qKVpPM1g0oaBrS1YdpbSBcoc18gwKT80jZcvTS0muKtHBlOfmbsegc9gfk /LR4elJD/B4hBs95z1er/5zjJnmICj8lhGXejqTWWS6TmfVoYI2pIU+2LJzIbDoG2Lme Kek4rSx/mH29CZZl5zQ9DcQCPDoMxSZAmGYZK6iKNvYzsvAjnXHXt/qZjZ4UV2wo1tFa zsyRfX85ohrquFlpUlKzTjx/I6v8F5xTsY8E28Tfo7KqSYvmRG/EyLjDY2TRKeqXW4tG HA== Received: from aserp3030.oracle.com (aserp3030.oracle.com [141.146.126.71]) by userp2130.oracle.com with ESMTP id 2t9brssrq2-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sun, 23 Jun 2019 00:41:23 +0000 Received: from pps.filterd (aserp3030.oracle.com [127.0.0.1]) by aserp3030.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x5N0fMKI155776; Sun, 23 Jun 2019 00:41:22 GMT Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by aserp3030.oracle.com with ESMTP id 2t9acb0fwb-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sun, 23 Jun 2019 00:41:22 +0000 Received: from abhmp0005.oracle.com (abhmp0005.oracle.com [141.146.116.11]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id x5N0fEuc021875; Sun, 23 Jun 2019 00:41:14 GMT Received: from ca-mkp.ca.oracle.com (/10.159.214.123) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Sat, 22 Jun 2019 17:41:14 -0700 To: Eric Wheeler Cc: Coly Li , linux-block@vger.kernel.org, Eric Wheeler , Eric Wheeler , Jonathan Corbet , Kent Overstreet , linux-doc@vger.kernel.org (open list:DOCUMENTATION), linux-kernel@vger.kernel.org (open list), linux-bcache@vger.kernel.org (open list:BCACHE (BLOCK LAYER CACHE)) Subject: Re: [PATCH] bcache: make stripe_size configurable and persistent for hardware raid5/6 From: "Martin K. Petersen" Organization: Oracle Corporation References: <1561245371-10235-1-git-send-email-bcache@lists.ewheeler.net> Date: Sat, 22 Jun 2019 20:41:11 -0400 In-Reply-To: <1561245371-10235-1-git-send-email-bcache@lists.ewheeler.net> (Eric Wheeler's message of "Sat, 22 Jun 2019 16:16:09 -0700") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1.92 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9296 signatures=668687 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=586 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1906230004 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9296 signatures=668687 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=641 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1906230004 Sender: linux-doc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org Eric, > While some drivers set queue_limits.io_opt (e.g., md raid5), there are > currently no SCSI/RAID controller drivers that do. That's not true. Lots of SCSI RAID devices report a stripe width. -- Martin K. Petersen Oracle Linux Engineering