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[23.128.96.18]) by mx.google.com with ESMTP id f9si4855538edm.167.2020.09.04.09.32.38; Fri, 04 Sep 2020 09:33:03 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-nfs-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@oracle.com header.s=corp-2020-01-29 header.b=ErX+9Szv; spf=pass (google.com: domain of linux-nfs-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-nfs-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=oracle.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726111AbgIDQcc (ORCPT + 99 others); Fri, 4 Sep 2020 12:32:32 -0400 Received: from userp2130.oracle.com ([156.151.31.86]:39228 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725966AbgIDQca (ORCPT ); Fri, 4 Sep 2020 12:32:30 -0400 Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 084GT2US027657; Fri, 4 Sep 2020 16:32:22 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=content-type : mime-version : subject : from : in-reply-to : date : cc : content-transfer-encoding : message-id : references : to; s=corp-2020-01-29; bh=mobjH6l3344YywUrN2Kiv1NpJi3FHXfcXnaJRlAuDtY=; b=ErX+9SzvUO3nDcmbHFlS1xoEUZUGUdmsTxiAD9T/YVKlS5oJunkupHum4opaV6gizLVa K17UJERwR9M7n3sgrt3BkiVOXMFsvTHvU/7A4oZYSd5GPyariEMjHkh6d0CUWm0A9V0m NLCssjmFwOCbXpWJZ/3/ZNKYqWkut6Ngk40OHiHnoAC/WBOxWZlGg1YFpD6xkZDWcDoU 31Ayn+W/1YkLDqKhajhuUDRbwFufUr3BEWtBUybImOGYvF+pIgZ5DshsRMtnO7HNz7tw Qf7K9aYqkDmlt9k1uGeQ/UH1Ol/nP+viArxDhUfw2wDouWJlBlJfH/PtRNvxUh2hZYNq 6A== Received: from userp3030.oracle.com (userp3030.oracle.com [156.151.31.80]) by userp2130.oracle.com with ESMTP id 337eerffja-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Fri, 04 Sep 2020 16:32:22 +0000 Received: from pps.filterd (userp3030.oracle.com [127.0.0.1]) by userp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 084GTpdM183703; Fri, 4 Sep 2020 16:30:22 GMT Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by userp3030.oracle.com with ESMTP id 33b7v2wvkg-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 04 Sep 2020 16:30:22 +0000 Received: from abhmp0008.oracle.com (abhmp0008.oracle.com [141.146.116.14]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 084GUG1x006218; Fri, 4 Sep 2020 16:30:21 GMT Received: from anon-dhcp-152.1015granger.net (/68.61.232.219) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 04 Sep 2020 09:30:16 -0700 Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.120.23.2.1\)) Subject: Re: [PATCH v4 2/5] NFSD: Add READ_PLUS data support From: Chuck Lever In-Reply-To: Date: Fri, 4 Sep 2020 12:30:15 -0400 Cc: Bruce Fields , Anna Schumaker , Linux NFS Mailing List Content-Transfer-Encoding: 7bit Message-Id: References: <20200901191854.GD12082@fieldses.org> <20200904135259.GB26706@fieldses.org> <00931C34-6C86-46A2-A3B3-9727DA5E739E@oracle.com> <20200904140324.GC26706@fieldses.org> <164C37D9-8044-4CF4-99A1-5FB722A16B8E@oracle.com> <20200904142923.GE26706@fieldses.org> <20200904144932.GA349848@pick.fieldses.org> <45DCF35D-A919-4A99-9B6D-0952ED0A78E5@oracle.com> <20200904152429.GA1738@fieldses.org> To: Bruce Fields X-Mailer: Apple Mail (2.3608.120.23.2.1) X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9734 signatures=668679 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxscore=0 malwarescore=0 spamscore=0 mlxlogscore=999 phishscore=0 bulkscore=0 suspectscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009040142 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9734 signatures=668679 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 clxscore=1015 priorityscore=1501 lowpriorityscore=0 malwarescore=0 adultscore=0 spamscore=0 mlxscore=0 phishscore=0 impostorscore=0 mlxlogscore=999 bulkscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009040142 Sender: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org > On Sep 4, 2020, at 12:17 PM, Chuck Lever wrote: > > > >> On Sep 4, 2020, at 11:24 AM, Bruce Fields wrote: >> >> I'm not seeing the RDMA connection, by the way. SEEK and READ_PLUS >> should work the same over TCP and RDMA. > > The READ_PLUS result is not DDP-eligible because there's no way for > the client to predict in advance whether there will be data (which > can be moved by RDMA), holes or patterns (which cannot), nor how > many of each there might be. > > Therefore I've asked Anna to leave READ_PLUS disabled on RDMA mounts. Since this is a public forum, I should clarify that READ_PLUS does work on NFS/RDMA mounts. It's just not as efficient as NFS READ with RDMA, and that kind of defeats its purpose as a replacement for NFS READ in everyday usage. -- Chuck Lever