From owner-freebsd-current@FreeBSD.ORG Fri Oct 5 18:01:43 2007 Return-Path: Delivered-To: freebsd-current@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 41E8416A420; Fri, 5 Oct 2007 18:01:43 +0000 (UTC) (envelope-from pjd@garage.freebsd.pl) Received: from mail.garage.freebsd.pl (arm132.internetdsl.tpnet.pl [83.17.198.132]) by mx1.freebsd.org (Postfix) with ESMTP id BAD7413C46A; Fri, 5 Oct 2007 18:01:42 +0000 (UTC) (envelope-from pjd@garage.freebsd.pl) Received: by mail.garage.freebsd.pl (Postfix, from userid 65534) id 56DE545F44; Fri, 5 Oct 2007 20:01:41 +0200 (CEST) Received: from localhost (154.81.datacomsa.pl [195.34.81.154]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.garage.freebsd.pl (Postfix) with ESMTP id 655FA456AB; Fri, 5 Oct 2007 20:01:34 +0200 (CEST) Date: Fri, 5 Oct 2007 20:01:19 +0200 From: Pawel Jakub Dawidek To: Darren Reed Message-ID: <20071005180119.GE98210@garage.freebsd.pl> References: <20071005000046.GC92272@garage.freebsd.pl> <47060857.2070001@freebsd.org> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="CdrF4e02JqNVZeln" Content-Disposition: inline In-Reply-To: <47060857.2070001@freebsd.org> User-Agent: Mutt/1.4.2.3i X-PGP-Key-URL: http://people.freebsd.org/~pjd/pjd.asc X-OS: FreeBSD 7.0-CURRENT i386 X-Spam-Checker-Version: SpamAssassin 3.0.4 (2005-06-05) on mail.garage.freebsd.pl X-Spam-Level: X-Spam-Status: No, score=-2.6 required=3.0 tests=BAYES_00 autolearn=ham version=3.0.4 Cc: freebsd-fs@FreeBSD.org, freebsd-current@FreeBSD.org Subject: Re: ZFS kmem_map too small. X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 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, 05 Oct 2007 18:01:43 -0000 --CdrF4e02JqNVZeln Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Oct 05, 2007 at 02:48:07AM -0700, Darren Reed wrote: > Pawel Jakub Dawidek wrote: > > Hi. > >=20 > > We'are about to branch RELENG_7 and I'd like to start discussion with > > folks that experience 'kmem_map too small' panic with the latest HEAD. > >=20 > > I'm trying hard to reproduce it and I can't, so I need to gather more > > info how you are able to provoke this panic. >=20 > Hmm, the first and only time it happened to me was when running cvsup > on the rsync'd freebsd CVS tree after creating a snapshot of it. I've > repeated that exercise since (and many times before) with no problems. >=20 > That was when I mistakingly had the ARC max set to be maybe 10MB or > so smaller than the kmem_map size (this was a mistake.) I've since > grown that gap to 100MB. >=20 > Tips on how to reproduce it? Make the kmem_map size small and set the > ARC's maximum size to be the same as it ? :) I'm not really interested in fixing configuration bugs, although we should do as much as we can to not allow bugus tunnings. I'm most interested in 'kmem_map too small' panic with default configuration, ie. no other changes than vm.kmem_size/vm.kmem_size_max. --=20 Pawel Jakub Dawidek http://www.wheel.pl pjd@FreeBSD.org http://www.FreeBSD.org FreeBSD committer Am I Evil? Yes, I Am! --CdrF4e02JqNVZeln Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.4 (FreeBSD) iD8DBQFHBnvvForvXbEpPzQRAgBVAKC9Mc5wGMyVvTO4KJhR02b7R0YZagCgkyxI 09PL4bks02BwfknklC1ZNWM= =Ws0m -----END PGP SIGNATURE----- --CdrF4e02JqNVZeln--