From owner-freebsd-fs@freebsd.org Fri Aug 9 13:22:36 2019 Return-Path: Delivered-To: freebsd-fs@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 57356C9383 for ; Fri, 9 Aug 2019 13:22:36 +0000 (UTC) (envelope-from bfriesen@simple.dallas.tx.us) Received: from mailman.nyi.freebsd.org (mailman.nyi.freebsd.org [IPv6:2610:1c1:1:606c::50:13]) by mx1.freebsd.org (Postfix) with ESMTP id 464mBN0yqmz4Z1j for ; Fri, 9 Aug 2019 13:22:36 +0000 (UTC) (envelope-from bfriesen@simple.dallas.tx.us) Received: by mailman.nyi.freebsd.org (Postfix) id 1F57FC9382; Fri, 9 Aug 2019 13:22:36 +0000 (UTC) Delivered-To: fs@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 1F171C9381 for ; Fri, 9 Aug 2019 13:22:36 +0000 (UTC) (envelope-from bfriesen@simple.dallas.tx.us) Received: from smtp.simplesystems.org (smtp.simplesystems.org [65.66.246.90]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 464mBM1LZZz4Z1f for ; Fri, 9 Aug 2019 13:22:34 +0000 (UTC) (envelope-from bfriesen@simple.dallas.tx.us) Received: from freddy.simplesystems.org (freddy.simplesystems.org [65.66.246.65]) by smtp.simplesystems.org (8.14.4+Sun/8.14.4) with ESMTP id x79DMRlH017357 for ; Fri, 9 Aug 2019 08:22:27 -0500 (CDT) Date: Fri, 9 Aug 2019 08:22:27 -0500 (CDT) From: Bob Friesenhahn X-X-Sender: bfriesen@freddy.simplesystems.org To: fs@freebsd.org Subject: Re: [Bug 237807] ZFS: ZVOL writes fast, ZVOL reads abysmal... In-Reply-To: Message-ID: References: User-Agent: Alpine 2.20 (GSO 67 2015-01-07) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (smtp.simplesystems.org [65.66.246.90]); Fri, 09 Aug 2019 08:22:27 -0500 (CDT) X-Rspamd-Queue-Id: 464mBM1LZZz4Z1f X-Spamd-Bar: --- Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none; spf=pass (mx1.freebsd.org: domain of bfriesen@simple.dallas.tx.us designates 65.66.246.90 as permitted sender) smtp.mailfrom=bfriesen@simple.dallas.tx.us X-Spamd-Result: default: False [-3.05 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-0.97)[-0.967,0]; FROM_HAS_DN(0.00)[]; R_SPF_ALLOW(-0.20)[+mx]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MIME_GOOD(-0.10)[text/plain]; TO_DN_NONE(0.00)[]; PREVIOUSLY_DELIVERED(0.00)[fs@freebsd.org]; RCPT_COUNT_ONE(0.00)[1]; NEURAL_HAM_LONG(-0.97)[-0.966,0]; RCVD_TLS_LAST(0.00)[]; NEURAL_HAM_SHORT(-0.84)[-0.838,0]; DMARC_NA(0.00)[dallas.tx.us]; IP_SCORE(0.03)[asn: 7018(0.18), country: US(-0.05)]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:7018, ipnet:65.64.0.0/13, country:US]; RCVD_COUNT_TWO(0.00)[2] X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 09 Aug 2019 13:22:36 -0000 On Fri, 9 Aug 2019, bugzilla-noreply@freebsd.org wrote: > https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237807 > > --- Comment #10 from Nils Beyer --- > maybe I'm too supid, I don't know. I can't get the pool fast... > > Created the pool from scratch. Updated to latest 12-STABLE. But reads from that > pool are still abysmal. There may indeed be an underlying problem, but for this application you should be using simple mirrors rather than raidz1 with just 3 disks each. Bob -- Bob Friesenhahn bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ Public Key, http://www.simplesystems.org/users/bfriesen/public-key.txt