From owner-freebsd-fs@freebsd.org Fri Aug 9 13:23:03 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 57FD4C93DF for ; Fri, 9 Aug 2019 13:23:03 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mailman.nyi.freebsd.org (unknown [127.0.1.3]) by mx1.freebsd.org (Postfix) with ESMTP id 464mBv1gwGz4Z4p for ; Fri, 9 Aug 2019 13:23:03 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: by mailman.nyi.freebsd.org (Postfix) id 39A04C93DE; Fri, 9 Aug 2019 13:23:03 +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 39679C93DD for ; Fri, 9 Aug 2019 13:23:03 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 464mBv0n6Dz4Z4n for ; Fri, 9 Aug 2019 13:23:03 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2610:1c1:1:606c::50:1d]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id F14A4E533 for ; Fri, 9 Aug 2019 13:23:02 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.5]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id x79DN23h058222 for ; Fri, 9 Aug 2019 13:23:02 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id x79DN2Xr058221 for fs@FreeBSD.org; Fri, 9 Aug 2019 13:23:02 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: fs@FreeBSD.org Subject: [Bug 237807] ZFS: ZVOL writes fast, ZVOL reads abysmal... Date: Fri, 09 Aug 2019 13:23:02 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 12.0-STABLE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: nbe@renzel.net X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: fs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 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 13:23:03 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D237807 --- Comment #11 from Nils Beyer --- increasing concurrency doesn't help: ---------------------------------------------------------------------------= ----- Version 1.97 ------Sequential Output------ --Sequential Input- --Ran= dom- Concurrency 16 -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --See= ks-- Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec= %CP veeambackups 64G 156 99 496023 58 117847 21 5 8 40116 8 942.0 = 17 Latency 54528us 315ms 293ms 1579ms 81741us 74544= us Version 1.97 ------Sequential Create------ --------Random Create----= ---- veeambackups -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete-- files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec= %CP 16 +++++ +++ +++++ +++ 16878 56 +++++ +++ +++++ +++ 31661= 99 Latency 2501us 43us 423ms 2225us 38us 91= us 1.97,1.97,veeambackups,16,1565363711,64G,,156,99,496023,58,117847,21,5,8,40= 116,8,942.0,17,16,,,,,+++++,+++,+++++,+++,16878,56,+++++,+++,+++++,+++,3166= 1,99,54528us,315ms,293ms,1579ms,81741us,74544us,2501us,43us,423ms,2225us,38= us,91us ---------------------------------------------------------------------------= ----- --=20 You are receiving this mail because: You are the assignee for the bug.=