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=-2.5 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 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 F3C2AC432C3 for ; Thu, 21 Nov 2019 15:45:40 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 C4F5C206B6 for ; Thu, 21 Nov 2019 15:45:40 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="ZHOsWTDX"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="X1o6GU7a" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C4F5C206B6 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=bombadil.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=o5tzv9CZq9uHgNxirONo+Ad6iRu1Qs5LO/8ayUI7oho=; b=ZHOsWTDX0MYny7 GdlAFejykDZl5cAkLFOfCrahgxH/OCzp+88h3PHnmtBGR9UP8DKGK3Y92j6q0wd8HfM2tN5fZwGmA tiIEIDJpwY1Zw9/vCV62JS8iEA0xonCyltK8Q1rmfPWfPRtG20/KFwWHs0tkPs+yGVURUNv0wwyGm WILZnrH9VREENyJSDTWdY5ImvF4lqKOrYA4oNclOzkx06uNJ7v7FOpEbrbV/13Lz1kYth6KByDDsy nrqjUGEYwHQ6zYERN4SL8bFJDgn7jnQheVicL1gXsry6ERwsk0Svmd/MfwjXrb2YlJkvWWc+qnu3r X4zlklT68wnxGv6CUIgw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1iXoeI-0005k6-1U; Thu, 21 Nov 2019 15:45:38 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1iXoeF-0005jX-Lv for linux-nvme@lists.infradead.org; Thu, 21 Nov 2019 15:45:36 +0000 Received: from redsun51.ssa.fujisawa.hgst.com (unknown [199.255.47.7]) (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 E31A52068E; Thu, 21 Nov 2019 15:45:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1574351134; bh=SkbZx1j9Lynw1nQMhhbfOW4JlWM8JMvQF0Shajv7Eg8=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=X1o6GU7apf2xbaEKtr0RkO6faiwPGhvj1I27jCgk7UHvK66o1Uds5al/BSIjaQBsu oOGf7K/OfJJx4PjoNqHIaMgyAT9yB8aw096iGVLu8bg4tLhFsvxg8R/3HuvWc2oyTu +qa4Y9jiwOm9W4a1/MRabxSolBDoO95Zppg2TPG4= Date: Fri, 22 Nov 2019 00:45:31 +0900 From: Keith Busch To: Ming Lei Subject: Re: [PATCH V3 0/2] nvme-pci: check CQ after batch submission for Microsoft device Message-ID: <20191121154531.GB17852@redsun51.ssa.fujisawa.hgst.com> References: <20191114025917.24634-1-ming.lei@redhat.com> <20191121031154.GJ24548@ming.t460p> <20191121061431.GA22886@lst.de> <20191121074643.GB4755@ming.t460p> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20191121074643.GB4755@ming.t460p> User-Agent: Mutt/1.12.1 (2019-06-15) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191121_074535_741131_945C0B90 X-CRM114-Status: GOOD ( 11.75 ) 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: Sagi Grimberg , Long Li , linux-nvme@lists.infradead.org, Jens Axboe , Nadolski Edmund , Christoph Hellwig 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 Thu, Nov 21, 2019 at 03:46:43PM +0800, Ming Lei wrote: > On Thu, Nov 21, 2019 at 07:14:31AM +0100, Christoph Hellwig wrote: > > On Thu, Nov 21, 2019 at 11:11:54AM +0800, Ming Lei wrote: > > > Hi Guys, > > > > > > Ping... > > > > I think everyone has told you that it is an invasive horrible hack > > that papers of the underlying problem(s). I'm not sure what more > > we can do here. > > The problem is that the NVMe driver applies aggressive interrupt > coalescing clearly, that can be addressed exactly by this approach. Can this default coalescing setting be turned off with a "set feature" command? _______________________________________________ Linux-nvme mailing list Linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme