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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 02A56C61DA4 for ; Mon, 6 Feb 2023 12:55:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229571AbjBFMzq (ORCPT ); Mon, 6 Feb 2023 07:55:46 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40668 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229488AbjBFMzp (ORCPT ); Mon, 6 Feb 2023 07:55:45 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D890214495 for ; Mon, 6 Feb 2023 04:54:57 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1675688097; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=K+jg2MDQ8zFuVv8INM8zR3Tx9pHjShGutK4vDD9pYLM=; b=a+K3fJegy86XT5dEO5ViTN0O5F4GdmKnB/v21VF9AMdaIp3J+c97H/N6N/S8hHtFyJBzGi YcOg4dTj6jTCTILbshthECmF+cYm6Cwk82tdw0cH7t7tjUueAxJurnd11AS399UaglCfdT /GeUIiHidxkbW170uEDf7BRys79wpC4= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-298-CNqVLlHoPmGo8-5twErLYw-1; Mon, 06 Feb 2023 07:54:51 -0500 X-MC-Unique: CNqVLlHoPmGo8-5twErLYw-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.rdu2.redhat.com [10.11.54.8]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id B99218027EB; Mon, 6 Feb 2023 12:54:50 +0000 (UTC) Received: from T590 (ovpn-8-17.pek2.redhat.com [10.72.8.17]) by smtp.corp.redhat.com (Postfix) with ESMTPS id DEA39C15BA0; Mon, 6 Feb 2023 12:54:41 +0000 (UTC) Date: Mon, 6 Feb 2023 20:54:36 +0800 From: Ming Lei To: Hans Holmberg Cc: "linux-block@vger.kernel.org" , Matias =?iso-8859-1?Q?Bj=F8rling?= , Damien Le Moal , Dennis Maisenbacher , Ajay Joshi , =?iso-8859-1?Q?J=F8rgen?= Hansen , "andreas@metaspace.dk" , "javier@javigon.com" , "slava@dubeyko.com" , "kbusch@kernel.org" , "hans@owltronix.com" , "mcgrof@kernel.org" , "guokuankuan@bytedance.com" , "viacheslav.dubeyko@bytedance.com" , "hch@lst.de" Subject: Re: [LSF/MM/BPF BoF]: A host FTL for zoned block devices using UBLK Message-ID: References: <20230206100019.GA6704@gsv> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Scanned-By: MIMEDefang 3.1 on 10.11.54.8 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On Mon, Feb 06, 2023 at 08:49:15PM +0800, Ming Lei wrote: > > ublk adds a bit of latency overhead, but I think this is acceptable at least > > until we have a great, proven solution, which could be turned into > > an in-kernel FTL. > > We will keep improving ublk io path, and I am working on ublk > copy. Once it is done, big chunk IO latency could be reduced a lot. s/copy/zero copy Thanks, Ming