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=-1.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 EAB65C433DF for ; Wed, 1 Jul 2020 13:21:46 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id B6587207D0 for ; Wed, 1 Jul 2020 13:21:46 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="TCt7ZC/u"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="B8q8+tLl" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B6587207D0 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References:Message-ID: Subject:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=mzzInsq0r8Oy/OmcLVFLeBu7rExs/ih+Z+nI+7R1PRI=; b=TCt7ZC/uDHKLLD+ddui+33Y2v GZZ2PtfQz4E/zr0qsdVpHGc0buyblizsNP0z7l57n7e25zORHjtN6a0NDlG/bYHm90PS7VJmYY7aV /ZzEP4xjWe+XNiHkZq5iBTnmrA8gJuLG+jvkoYenQ5U2lx7tspwVQEkQs1yLAFqPROgnmtwwee9yw QcTibWeo7LI7VpVaGDYWwVl4ThdwK69yQQcQlGXUS49b3A1nHtU9pWohGl56eAokGf2roY4ynXxIp gWFTZDpE5MrEEr+k3XfTw9yF1TQj5NWVXgjGfE0k66zyMNkbalyxsGXzOPUj5kkXld/KmMr1KyAl2 2tOtf4ipw==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jqcgJ-0006ns-Bx; Wed, 01 Jul 2020 13:21:43 +0000 Received: from mail.kernel.org ([198.145.29.99]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jqcgG-0006nE-Sp for linux-nvme@lists.infradead.org; Wed, 01 Jul 2020 13:21:41 +0000 Received: from dhcp-10-100-145-180.wdl.wdc.com (unknown [199.255.45.60]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 963C520702; Wed, 1 Jul 2020 13:21:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1593609699; bh=bDytJjgjFGriMO4euecDO7CZ8UsgCcc2mr6P8UdRLxY=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=B8q8+tLlSP+3vO6buSNu57WbRF1+rjnAMayde82/ZtrjvhKBJOZJIBM+pD6d+YmJM fuhBQRJMgDvCg9va1v1yaQvl481Oqa/R8orRAaC2L0Q1UK55D1LMt0mZqZ7zpe4pUU kD9SuoE7RYv+xcxKTvYH89CeOhuGUSRzkgjR55jo= Date: Wed, 1 Jul 2020 06:21:37 -0700 From: Keith Busch To: Christoph Hellwig Subject: Re: [PATCH V2 0/2] nvme: replace linked list with xarray for ns tracking Message-ID: <20200701132137.GA1988944@dhcp-10-100-145-180.wdl.wdc.com> References: <20200701022517.6738-1-chaitanya.kulkarni@wdc.com> <20200701053609.GA28056@lst.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200701053609.GA28056@lst.de> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200701_092141_016976_28A9902B X-CRM114-Status: GOOD ( 14.57 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-nvme@lists.infradead.org, sagi@grimberg.me, Chaitanya Kulkarni Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org On Wed, Jul 01, 2020 at 07:36:09AM +0200, Christoph Hellwig wrote: > On Tue, Jun 30, 2020 at 07:25:15PM -0700, Chaitanya Kulkarni wrote: > > Hi, > > > > This is a small patch-series which replaces ctrl->namespaces with > > xarray for host-core and target-core. We can see following > > performance improvement when running fio with 32 parallel jobs where > > first 16 namespaces and last 16 namespaces are used for I/O. See [1] for > > detailed performance numbers. > > Why would that make any difference given that we don't look up namespaces > in the I/O path? Not in host side. Target does a lookup on each IO through: nvmet_req_init() nvmet_parse_io_cmrd() nvmet_find_namespaces() And this detail should be mentioned in the test setup for the cover letter, or in patch 2. _______________________________________________ Linux-nvme mailing list Linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme