From owner-freebsd-fs@FreeBSD.ORG Wed Jul 27 14:18:32 2011 Return-Path: Delivered-To: freebsd-fs@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 111261065670; Wed, 27 Jul 2011 14:18:32 +0000 (UTC) (envelope-from prvs=11896da94d=killing@multiplay.co.uk) Received: from mail1.multiplay.co.uk (mail1.multiplay.co.uk [85.236.96.23]) by mx1.freebsd.org (Postfix) with ESMTP id 5FE5D8FC13; Wed, 27 Jul 2011 14:18:31 +0000 (UTC) X-MDAV-Processed: mail1.multiplay.co.uk, Wed, 27 Jul 2011 15:17:59 +0100 X-Spam-Processed: mail1.multiplay.co.uk, Wed, 27 Jul 2011 15:17:59 +0100 X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on mail1.multiplay.co.uk X-Spam-Level: X-Spam-Status: No, score=-5.0 required=6.0 tests=USER_IN_WHITELIST shortcircuit=ham autolearn=disabled version=3.2.5 Received: from r2d2 ([188.220.16.49]) by mail1.multiplay.co.uk (mail1.multiplay.co.uk [85.236.96.23]) (MDaemon PRO v10.0.4) with ESMTP id md50014342069.msg; Wed, 27 Jul 2011 15:17:59 +0100 X-MDRemoteIP: 188.220.16.49 X-Return-Path: prvs=11896da94d=killing@multiplay.co.uk X-Envelope-From: killing@multiplay.co.uk Message-ID: <5C84E7C8452E489C8CA738294F5EBB78@multiplay.co.uk> From: "Steven Hartland" To: "Andriy Gapon" References: <0D449EC916264947AB31AA17F870EA7A@multiplay.co.uk> <4E3013DF.10803@FreeBSD.org> <3D6CEB50BEDD4ACE96FD35C4D085618A@multiplay.co.uk> <4E301C55.7090105@FreeBSD.org> Date: Wed, 27 Jul 2011 15:18:38 +0100 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5931 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.6109 Cc: freebsd-fs@FreeBSD.org Subject: Re: zfs process hang on pool access X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 27 Jul 2011 14:18:32 -0000 ----- Original Message ----- From: "Andriy Gapon" To: "Steven Hartland" Cc: Sent: Wednesday, July 27, 2011 3:10 PM Subject: Re: zfs process hang on pool access > on 27/07/2011 16:55 Steven Hartland said the following: >> Apparently it seems to affect machines >> with high uptimes, if thats of help. This machine shows:- >> >> uptime >> 1:55PM up 112 days, 3:19, 1 user, load averages: 0.00, 0.00, 0.00 > > Just a guess, perhaps it's another manifestation of this issue: > http://lists.freebsd.org/pipermail/freebsd-fs/2011-May/011584.html Not sure looking at that thread and comparing to the machine:- top -SHb 500 | grep arc 7 root -8 - 0K 88K arc_re 0 11:07 0.00% {arc_reclaim_thre} 7 root -8 - 0K 88K l2arc_ 2 0:52 0.00% {l2arc_feed_threa} So no excessive cpu for reclaim is present and evict_skip is not incrementing: sysctl kstat.zfs.misc.arcstats.evict_skip kstat.zfs.misc.arcstats.evict_skip: 235572240 sleep 60 sysctl kstat.zfs.misc.arcstats.evict_skip kstat.zfs.misc.arcstats.evict_skip: 235572240 Regards Steve ================================================ This e.mail is private and confidential between Multiplay (UK) Ltd. and the person or entity to whom it is addressed. In the event of misdirection, the recipient is prohibited from using, copying, printing or otherwise disseminating it or any information contained in it. In the event of misdirection, illegible or incomplete transmission please telephone +44 845 868 1337 or return the E.mail to postmaster@multiplay.co.uk.