From owner-freebsd-fs@freebsd.org Thu Dec 7 08:39:15 2017 Return-Path: Delivered-To: freebsd-fs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 4E6AFE80335 for ; Thu, 7 Dec 2017 08:39:15 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (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 232607C5A7 for ; Thu, 7 Dec 2017 08:39:15 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from bugs.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id vB78dE4x044902 for ; Thu, 7 Dec 2017 08:39:14 GMT (envelope-from bugzilla-noreply@freebsd.org) From: bugzilla-noreply@freebsd.org To: freebsd-fs@FreeBSD.org Subject: [Bug 224080] ZFS: "arc_dnlc_evicts_thr" + "arc_reclaim_thread" - high CPU load during poudriere build... Date: Thu, 07 Dec 2017 08:39:15 +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: CURRENT X-Bugzilla-Keywords: regression X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: cy@FreeBSD.org X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: freebsd-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: 2.1.25 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 Dec 2017 08:39:15 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D224080 --- Comment #16 from Cy Schubert --- I've done some testing with r326347 reverted and with r326346 + r326347 reverted. My test included I/O intensive operations including buildworld/buildkernel -DNO_CLEAN and parallel rsync. Removing r326346 + r326347 showed no significant improvement over removal of only r326347 (bel= ow). r326347 definitely caused the issue. Note MFU. Performance is significantly better due to improved ARC caching. last pid: 2156; load averages: 2.56, 2.32, 1.66 up 0+00:25:52 00:3= 2:57 89 processes: 4 running, 85 sleeping CPU: 1.3% user, 75.8% nice, 20.5% system, 0.8% interrupt, 1.7% idle Mem: 390M Active, 602M Inact, 5631M Wired, 63M Buf, 1317M Free ARC: 3585M Total, 1106M MFU, 2029M MRU, 14M Anon, 60M Header, 376M Other 2734M Compressed, 6084M Uncompressed, 2.23:1 Ratio Swap: 20G Total, 20G Free PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU CO= MMAN 63633 root 1 52 0 36720K 27164K RUN 1 2:28 7.38% pkg 2136 root 1 4 10 10548K 1932K select 0 0:00 6.32% ma= ke 1909 root 1 4 10 11808K 3144K select 1 0:00 0.36% ma= ke 2096 root 1 24 0 13804K 3952K CPU1 1 0:00 0.11% top 2135 root 1 52 10 11700K 3124K wait 1 0:00 0.11% sh 3598 root 1 20 0 14312K 5216K select 0 0:02 0.10% sc= reen 98994 root 1 4 10 28516K 20320K select 1 0:01 0.10% ma= ke 1828 root 1 52 10 10404K 1608K select 1 0:00 0.07% ma= ke 61839 root 1 30 10 10196K 1324K select 1 0:00 0.05% ma= ke 1906 root 1 4 10 10360K 1468K select 1 0:00 0.05% ma= ke 98907 root 1 30 10 10980K 2340K select 1 0:00 0.04% ma= ke 99013 root 1 30 10 23784K 15508K select 1 0:00 0.04% ma= ke 2712 root 1 20 0 14352K 5624K select 1 0:00 0.02% de= vd 3137 root 1 20 0 10860K 2456K select 0 0:00 0.01% po= werd --=20 You are receiving this mail because: You are the assignee for the bug.=