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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id B0D43C433EF for ; Thu, 25 Nov 2021 21:05:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Reply-To:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type: MIME-Version:References:Message-ID:In-Reply-To:Subject:cc:To:From:Date: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=EJRrCwz7cn27w+55ufaAfco/0pylwDPRkMyQmLpx0pM=; b=TqD1stJFXo18EVu551kMnMP+2/ 817ujNfsShCG+s45Ff4RP/uUWEJV1NHU3Vn5MLXL/hulc3DOnfuO+w1E0WX+r+aWYYiSkPykhzT3r XK++bFjnfs3tcoooLmIBFC6CzgtipNUce/adc4Ma4fvrNRGvnQrGpO/i2bqbnpHJ2BpscD0VTtZ6j KIdjOaNRjBgmKy5STVLVhJpp6ry2CFGErOhP9lJ7G4R4/ffvm0jifY8wrVRLg8KLRKfQtgZSF4FY7 Xx5i14N2wfD97d4MA+8A7p4eVSe0fsI7Y4p7imHvM0t2PaBJCZca99K1j4GqRhPflNRsFlA0t3Pv0 CioO6anw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mqLvt-008dus-44; Thu, 25 Nov 2021 21:05:29 +0000 Received: from mailbackend.panix.com ([166.84.1.89]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mqLvm-008du8-RA for linux-nvme@lists.infradead.org; Thu, 25 Nov 2021 21:05:24 +0000 Received: from [192.168.126.80] (ip98-184-250-31.oc.oc.cox.net [98.184.250.31]) by mailbackend.panix.com (Postfix) with ESMTPSA id 4J0Vl1638fz2sJY; Thu, 25 Nov 2021 16:05:17 -0500 (EST) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=panix.com; s=panix; t=1637874318; bh=/phpLN81VHGxqAiAfyH0Geo3FSMKK9AauWc37cUnhQE=; h=Date:From:Reply-To:To:cc:Subject:In-Reply-To:References; b=eGCNwMmEWIkD/rVJtOna7ZeyO9BUB8nxnWHdUeU1wb8TDU9rJphJ2/XTvCX+Xo76w BYhE2efhCHKaIpq7XwKimblUSrkrVGVxnfzyUGPAeJZsbwHXZetcZWVFWYNWILFK7p ub0IKxBXH+WxWHmc8eBrEbYQKVHigme0nXEvLnNw= Date: Thu, 25 Nov 2021 13:05:16 -0800 (PST) From: "Kenneth R. Crudup" To: Jens Axboe cc: linux-bcache@vger.kernel.org, linux-block@vger.kernel.org, linux-ext4@vger.kernel.org, linux-nvme@lists.infradead.org, "Kenneth R. Crudup" Subject: Re: Write I/O queue hangup at random on recent Linus' kernels In-Reply-To: Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211125_130523_063636_16020AA7 X-CRM114-Status: UNSURE ( 6.59 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: "Kenneth R. Crudup" Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org On Tue, 23 Nov 2021, Jens Axboe wrote: > It looks like some missed accounting. You can just disable wbt for now, would > be a useful data point to see if that fixes it. Just do: > echo 0 > /sys/block/nvme0n1/queue/wbt_lat_usec > and that will disable writeback throttling on that device. It's been about 48 hours and haven't seen the issue since doing this. -Kenny -- Kenneth R. Crudup / Sr. SW Engineer, Scott County Consulting, Orange County CA