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=-5.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY autolearn=no 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 986CCC433FE for ; Wed, 9 Dec 2020 03:05:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5EFBC238A0 for ; Wed, 9 Dec 2020 03:05:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726918AbgLIDFc (ORCPT ); Tue, 8 Dec 2020 22:05:32 -0500 Received: from userp2130.oracle.com ([156.151.31.86]:54294 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725789AbgLIDFc (ORCPT ); Tue, 8 Dec 2020 22:05:32 -0500 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 0B933vWE013387; Wed, 9 Dec 2020 03:04:27 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=to : cc : subject : from : in-reply-to : message-id : references : date : mime-version : content-type; s=corp-2020-01-29; bh=im6KM1TeupZ7+OOqaL16g9WQ+py93dKnhY0FXeXUVrg=; b=CgT2u9G+DufvhAow7IPt573MPTsgelj/WTscwwx8qiipLPEte677SGvrA95oyHIIFtj1 +3aR1DPmDfiFXTj8R7jfEEoEGfhshcE9Gx3L6Uo+9pfEEoMODoRGJZT0Lcj6RhSkp4Cb WIFVPvCeWshgSTiRQt7KK9u8u1zZCjvG0ImXHSnNpCGrIkXXRIuo+LM0uAL3AuMP+l3c gfAF4QZAXkme6Ee3vL2DjCy2x/3J9GHF7wL6u6tyPA+OqvqYgnAX0CbRpsEILyu//66a J/RvZqMLg7j+p1VGXFJgqMeh0BMS4ue9hQpCCkOzcvS02jsee+Wj38jGCf3JKgAapMr0 NA== Received: from userp3030.oracle.com (userp3030.oracle.com [156.151.31.80]) by userp2130.oracle.com with ESMTP id 3581mqwxu4-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Wed, 09 Dec 2020 03:04:26 +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 0B92tiw1007609; Wed, 9 Dec 2020 03:04:26 GMT Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by userp3030.oracle.com with ESMTP id 358m4yujv1-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 09 Dec 2020 03:04:26 +0000 Received: from abhmp0019.oracle.com (abhmp0019.oracle.com [141.146.116.25]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 0B934MK3021556; Wed, 9 Dec 2020 03:04:22 GMT Received: from ca-mkp.ca.oracle.com (/10.159.214.123) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Tue, 08 Dec 2020 19:04:20 -0800 To: Hannes Reinecke Cc: Christoph Hellwig , SelvaKumar S , linux-nvme@lists.infradead.org, kbusch@kernel.org, axboe@kernel.dk, damien.lemoal@wdc.com, sagi@grimberg.me, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, dm-devel@redhat.com, snitzer@redhat.com, selvajove@gmail.com, nj.shetty@samsung.com, joshi.k@samsung.com, javier.gonz@samsung.com, "Martin K. Petersen" , Bart Van Assche , Mikulas Patocka , linux-scsi@vger.kernel.org Subject: Re: [RFC PATCH v2 0/2] add simple copy support From: "Martin K. Petersen" In-Reply-To: <01fe46ac-16a5-d4db-f23d-07a03d3935f3@suse.de> (Hannes Reinecke's message of "Mon, 7 Dec 2020 15:56:15 +0100") Organization: Oracle Corporation Message-ID: References: <20201204094659.12732-1-selvakuma.s1@samsung.com> <20201207141123.GC31159@lst.de> <01fe46ac-16a5-d4db-f23d-07a03d3935f3@suse.de> Date: Tue, 08 Dec 2020 22:02:35 -0500 MIME-Version: 1.0 Content-Type: text/plain X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9829 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxscore=0 spamscore=0 suspectscore=1 bulkscore=0 malwarescore=0 phishscore=0 adultscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2012090018 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9829 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=1 mlxlogscore=999 clxscore=1011 malwarescore=0 priorityscore=1501 adultscore=0 lowpriorityscore=0 phishscore=0 spamscore=0 impostorscore=0 mlxscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2012090019 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Hannes, [Sorry I'm late to the discussion here, had a few fires going in addition to the end of the kernel cycle] > And we shouldn't forget that the main issue which killed all previous > implementations was a missing QoS guarantee. That and the fact that our arbitrary stacking situation was hard to resolve. The QoS guarantee was somewhat addressed by Fred in T10. But I agree we need some sort of toggle. -- Martin K. Petersen Oracle Linux Engineering