From owner-freebsd-current@FreeBSD.ORG Fri Oct 25 08:09:01 2013 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTP id B066FC83 for ; Fri, 25 Oct 2013 08:09:01 +0000 (UTC) (envelope-from prvs=101050af22=killing@multiplay.co.uk) Received: from mail1.multiplay.co.uk (mail1.multiplay.co.uk [85.236.96.23]) (using TLSv1 with cipher RC4-MD5 (128/128 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id 4AD512505 for ; Fri, 25 Oct 2013 08:09:00 +0000 (UTC) Received: from r2d2 ([82.69.141.170]) by mail1.multiplay.co.uk (mail1.multiplay.co.uk [85.236.96.23]) (MDaemon PRO v10.0.4) with ESMTP id md50006500119.msg for ; Fri, 25 Oct 2013 09:08:56 +0100 X-Spam-Processed: mail1.multiplay.co.uk, Fri, 25 Oct 2013 09:08:56 +0100 (not processed: message from valid local sender) X-MDDKIM-Result: neutral (mail1.multiplay.co.uk) X-MDRemoteIP: 82.69.141.170 X-Return-Path: prvs=101050af22=killing@multiplay.co.uk X-Envelope-From: killing@multiplay.co.uk X-MDaemon-Deliver-To: freebsd-current@freebsd.org Message-ID: <96FA3CD4CDCE49268EF41E28FF4E9381@multiplay.co.uk> From: "Steven Hartland" To: "Vitalij Satanivskij" References: <1381166916.122992963.5h9ygiri@frv45.ukr.net> <1381170764.32684.31088349.343931EE@webmail.messagingengine.com> <20131007185032.GA82932@hell.ukr.net> <20131007211201.GA89306@hell.ukr.net> <20131010092223.GA28347@hell.ukr.net> <5256D9D4.2030308@allanjude.com> <20131010170334.GA71635@hell.ukr.net> <3E3F85F87B0D40C6A776A42786EEF08D@multiplay.co.uk> <20131022141055.GA34810@hell.ukr.net> <5C339A76AE4C402BA5F9F1470500246A@multiplay.co.uk> <20131025073219.GA4086@hell.ukr.net> Subject: Re: ZFS L2ARC - incorrect size and abnormal system load on r255173 Date: Fri, 25 Oct 2013 09:08:58 +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 V6.00.2900.6157 Cc: Vitalij Satanivskij , freebsd-current@freebsd.org, Dmitriy Makarov X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 25 Oct 2013 08:09:01 -0000 I would have expected zero for all l2_compress values. Regards Steve ----- Original Message ----- From: "Vitalij Satanivskij" To: "Steven Hartland" Cc: "Vitalij Satanivskij" ; "Dmitriy Makarov" ; Sent: Friday, October 25, 2013 8:32 AM Subject: Re: ZFS L2ARC - incorrect size and abnormal system load on r255173 > Just after system reboot with this patch > > found > kstat.zfs.misc.arcstats.l2_compress_successes: 6083 > kstat.zfs.misc.arcstats.l2_compress_zeros: 1 > kstat.zfs.misc.arcstats.l2_compress_failures: 296 > > compression on test pool (where I'm test this patch) is lz4 > > so is it ok ? > > > > Steven Hartland wrote: > SH> If you are still seeing high load try commenting out the following > SH> which should disable l2arc compression. > SH> sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c > SH> if (l2arc_compress) > SH> hdr->b_flags |= ARC_L2COMPRESS; > SH> > ================================================ 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.