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=-2.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT autolearn=ham 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 1E68DC43381 for ; Fri, 22 Mar 2019 17:36:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E5C71218A1 for ; Fri, 22 Mar 2019 17:36:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553276197; bh=GWmzpEXHZLcTlnW83g5ygRKMuvBGrH3uZgBq4va+EMA=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=lzjlD/CwRigiGXN6olvM8xAuky6STzKrDD3MpReJq9DNKGOeYTHMPak6YHZ/iai8q 2JfK8b/1xpR+HaerDjNUwzx7yUYB8HFl5giO1ZwbfAKhPCdktWfajQfzQgAbevl7cP L1WOFz124eLJ5I07Dayme28IO+/e+RFfa5cqzcG8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727203AbfCVRgg (ORCPT ); Fri, 22 Mar 2019 13:36:36 -0400 Received: from mga07.intel.com ([134.134.136.100]:23456 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725981AbfCVRgg (ORCPT ); Fri, 22 Mar 2019 13:36:36 -0400 X-Amp-Result: UNSCANNABLE X-Amp-File-Uploaded: False Received: from orsmga004.jf.intel.com ([10.7.209.38]) by orsmga105.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 22 Mar 2019 10:36:35 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.60,256,1549958400"; d="scan'208";a="285028592" Received: from unknown (HELO localhost.localdomain) ([10.232.112.69]) by orsmga004.jf.intel.com with ESMTP; 22 Mar 2019 10:36:35 -0700 Date: Fri, 22 Mar 2019 11:37:36 -0600 From: Keith Busch To: Christoph Hellwig Cc: Jens Axboe , Keith Busch , Sagi Grimberg , linux-nvme@lists.infradead.org, linux-block@vger.kernel.org Subject: Re: [RFC] optimize nvme single segment I/O Message-ID: <20190322173736.GC31194@localhost.localdomain> References: <20190321231037.25104-1-hch@lst.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190321231037.25104-1-hch@lst.de> User-Agent: Mutt/1.9.1 (2017-09-22) Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On Thu, Mar 21, 2019 at 04:10:22PM -0700, Christoph Hellwig wrote: > Hi all, > > with all the discussion on small I/O performance lately I thought > it was time off to dust my old idea to optimize this path a bit > by avoiding to build a scatterlist. I've only done very basic > testing because I've been a bit busy, but I thought it might be > worthwhile to get it out for feedback. Tests well here with a measurable IOPs improvement at lower queue depths. Series looks good to me, especially patch 5! :p Reviewed-by: Keith Busch