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[213.16.240.129]) by smtp.gmail.com with ESMTPSA id x15-20020adfdd8f000000b001f0473a0a3fsm2705941wrl.14.2022.03.03.10.36.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 03 Mar 2022 10:36:44 -0800 (PST) Message-ID: <0e63b59c-779c-d85b-693e-79d2924acbe0@arrikto.com> Date: Thu, 3 Mar 2022 20:36:42 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.6.1 Subject: Re: [LSF/MM/BFP ATTEND] [LSF/MM/BFP TOPIC] Storage: Copy Offload Content-Language: en-US To: Chaitanya Kulkarni Cc: "linux-block@vger.kernel.org" , "linux-scsi@vger.kernel.org" , "dm-devel@redhat.com" , "linux-nvme@lists.infradead.org" , linux-fsdevel , Jens Axboe , "msnitzer@redhat.com >> msnitzer@redhat.com" , Bart Van Assche , "martin.petersen@oracle.com >> Martin K. Petersen" , "roland@purestorage.com" , "mpatocka@redhat.com" , Hannes Reinecke , "kbus >> Keith Busch" , Christoph Hellwig , "Frederick.Knight@netapp.com" , "zach.brown@ni.com" , "osandov@fb.com" , "lsf-pc@lists.linux-foundation.org" , "djwong@kernel.org" , "josef@toxicpanda.com" , "clm@fb.com" , "dsterba@suse.com" , "tytso@mit.edu" , "jack@suse.com" References: <012723a9-2e9c-c638-4944-fa560e1b0df0@arrikto.com> From: Nikos Tsironis In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On 3/1/22 23:32, Chaitanya Kulkarni wrote: > Nikos, > >>> [8] https://kernel.dk/io_uring.pdf >> >> I would like to participate in the discussion too. >> >> The dm-clone target would also benefit from copy offload, as it heavily >> employs dm-kcopyd. I have been exploring redesigning kcopyd in order to >> achieve increased IOPS in dm-clone and dm-snapshot for small copies over >> NVMe devices, but copy offload sounds even more promising, especially >> for larger copies happening in the background (as is the case with >> dm-clone's background hydration). >> >> Thanks, >> Nikos > > If you can document your findings here it will be great for me to > add it to the agenda. > Hi, Give me a few days to gather my notes, because it's been a while since the last time I worked on this, and I will come back with a summary of my findings. Nikos 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 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 59A1AC433EF for ; Thu, 3 Mar 2022 18:37:04 +0000 (UTC) Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-543-jRIGlsgqODW62j_d7abEAw-1; Thu, 03 Mar 2022 13:37:01 -0500 X-MC-Unique: jRIGlsgqODW62j_d7abEAw-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 5E1D6824FA6; Thu, 3 Mar 2022 18:36:56 +0000 (UTC) Received: from colo-mx.corp.redhat.com (colo-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.21]) by smtp.corp.redhat.com (Postfix) with ESMTPS id C238B804E9; Thu, 3 Mar 2022 18:36:55 +0000 (UTC) Received: from lists01.pubmisc.prod.ext.phx2.redhat.com (lists01.pubmisc.prod.ext.phx2.redhat.com [10.5.19.33]) by colo-mx.corp.redhat.com (Postfix) with ESMTP id 07CB74EA37; Thu, 3 Mar 2022 18:36:53 +0000 (UTC) Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) by lists01.pubmisc.prod.ext.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id 223IamPG013812 for ; Thu, 3 Mar 2022 13:36:49 -0500 Received: by smtp.corp.redhat.com (Postfix) id 942DE4010E6C; Thu, 3 Mar 2022 18:36:48 +0000 (UTC) Received: from mimecast-mx02.redhat.com (mimecast10.extmail.prod.ext.rdu2.redhat.com [10.11.55.26]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 9003F4010FCB for ; Thu, 3 Mar 2022 18:36:48 +0000 (UTC) Received: from us-smtp-1.mimecast.com (us-smtp-delivery-1.mimecast.com [205.139.110.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 682651C0D105 for ; Thu, 3 Mar 2022 18:36:48 +0000 (UTC) Received: from mail-wr1-f51.google.com (mail-wr1-f51.google.com [209.85.221.51]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-204-nO5GfK3_MT2FUsEGiKrduw-1; Thu, 03 Mar 2022 13:36:46 -0500 X-MC-Unique: nO5GfK3_MT2FUsEGiKrduw-1 Received: by mail-wr1-f51.google.com with SMTP id u10so7563171wra.9 for ; Thu, 03 Mar 2022 10:36:46 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:message-id:date:mime-version:user-agent:subject :content-language:to:cc:references:from:in-reply-to :content-transfer-encoding; bh=gSsCl/XOESNqiNL4KQnFJzGeYGKZJS/OXefqIbgZZJY=; b=VvpDVmPGrXdqwLTY+X5jtUNNIn9VAf26Hrkn/OeCPH0BQYQ6BXKS39LAAo7k1pj1Lr XouNmToJZx5bI3FW4nwqwHyG9UF9zhlMqTBzSlN9e3BZ5EacquKOU2LZ7bILTXTblk8a +48OCan8Mwqw8Y3C72+FNFCmKIHywsb6oSHKE0DtT7OMKBBVlJ8T25u5aem47uuMiMzl f75XCEQZuVTKRxIqACV5/G25XqjsfpA6Ixxa4T3XzqZa8N3R4zhhj2yVQ0jJf9goeWfw Qojp1zIyyBBamyTwl9f669bL2jgIumkiA3RsZzDwJ936814QP0FcuiPT4XdpoEeVC4D2 YoZA== X-Gm-Message-State: AOAM5326WitSFYGdZfqM7uy7CyK1ybQGJsUiAIfmacFAGzF1foMTk5PQ hTMuKJZ6E6ACKEGBI+7/EtBo4A== X-Google-Smtp-Source: ABdhPJxWp//CMSQXMH4wlOTWsuUAaFU8DcmiZw37tn30FWgGhLmSgbx50j5GThznhd1HjqQ4Zon/5g== X-Received: by 2002:a5d:61cb:0:b0:1f0:2598:88ff with SMTP id q11-20020a5d61cb000000b001f0259888ffmr7318696wrv.444.1646332605416; Thu, 03 Mar 2022 10:36:45 -0800 (PST) Received: from [172.16.10.50] (213.16.240.129.dsl.dyn.forthnet.gr. [213.16.240.129]) by smtp.gmail.com with ESMTPSA id x15-20020adfdd8f000000b001f0473a0a3fsm2705941wrl.14.2022.03.03.10.36.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 03 Mar 2022 10:36:44 -0800 (PST) Message-ID: <0e63b59c-779c-d85b-693e-79d2924acbe0@arrikto.com> Date: Thu, 3 Mar 2022 20:36:42 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.6.1 To: Chaitanya Kulkarni References: <012723a9-2e9c-c638-4944-fa560e1b0df0@arrikto.com> From: Nikos Tsironis In-Reply-To: X-Mimecast-Impersonation-Protect: Policy=CLT - Impersonation Protection Definition; Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 2.84 on 10.11.54.1 X-loop: dm-devel@redhat.com Cc: "djwong@kernel.org" , "linux-nvme@lists.infradead.org" , "clm@fb.com" , "dm-devel@redhat.com" , "osandov@fb.com" , "msnitzer@redhat.com >> msnitzer@redhat.com" , Bart Van Assche , "linux-scsi@vger.kernel.org" , Christoph Hellwig , "roland@purestorage.com" , "zach.brown@ni.com" , "dsterba@suse.com" , "josef@toxicpanda.com" , "linux-block@vger.kernel.org" , "mpatocka@redhat.com" , "kbus >> Keith Busch" , "Frederick.Knight@netapp.com" , Jens Axboe , "tytso@mit.edu" , "martin.petersen@oracle.com >> Martin K. Petersen" , "jack@suse.com" , linux-fsdevel , "lsf-pc@lists.linux-foundation.org" Subject: Re: [dm-devel] [LSF/MM/BFP ATTEND] [LSF/MM/BFP TOPIC] Storage: Copy Offload X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=dm-devel-bounces@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" On 3/1/22 23:32, Chaitanya Kulkarni wrote: > Nikos, > >>> [8] https://kernel.dk/io_uring.pdf >> >> I would like to participate in the discussion too. >> >> The dm-clone target would also benefit from copy offload, as it heavily >> employs dm-kcopyd. I have been exploring redesigning kcopyd in order to >> achieve increased IOPS in dm-clone and dm-snapshot for small copies over >> NVMe devices, but copy offload sounds even more promising, especially >> for larger copies happening in the background (as is the case with >> dm-clone's background hydration). >> >> Thanks, >> Nikos > > If you can document your findings here it will be great for me to > add it to the agenda. > Hi, Give me a few days to gather my notes, because it's been a while since the last time I worked on this, and I will come back with a summary of my findings. Nikos -- dm-devel mailing list dm-devel@redhat.com https://listman.redhat.com/mailman/listinfo/dm-devel