From owner-freebsd-current@FreeBSD.ORG Tue Jan 27 14:20:23 2004 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id CE78A16A4CE; Tue, 27 Jan 2004 14:20:23 -0800 (PST) Received: from farside.isc.org (farside.isc.org [204.152.187.5]) by mx1.FreeBSD.org (Postfix) with ESMTP id B583E43D86; Tue, 27 Jan 2004 14:20:22 -0800 (PST) (envelope-from Peter_Losher@isc.org) Received: from tardis.isc.org (tardis.isc.org [IPv6:2001:4f8:3:bb:230:1bff:fe31:a192]) (using TLSv1 with cipher RC4-MD5 (128/128 bits)) (No client certificate requested) by farside.isc.org (Postfix) with ESMTP id C2837A83E; Tue, 27 Jan 2004 22:20:08 +0000 (UTC) (envelope-from Peter_Losher@isc.org) From: Peter Losher Organization: ISC To: John Baldwin Date: Tue, 27 Jan 2004 14:19:54 -0800 User-Agent: KMail/1.5.94 References: <20040127082106.L14045@farside.isc.org> <200401271334.07761.jhb@FreeBSD.org> In-Reply-To: <200401271334.07761.jhb@FreeBSD.org> MIME-Version: 1.0 Content-Disposition: inline Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message-Id: <200401271420.05240.Peter_Losher@isc.org> cc: current@freebsd.org Subject: Re: spin lock panic in 5.2-REL X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 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: Tue, 27 Jan 2004 22:20:23 -0000 =2D----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Tuesday 27 January 2004 10:34 am, John Baldwin wrote: > This is a very hard to debug problem. If WITNESS is on it provides more > useful information that can help track that down, but I wouldn't expect a > production machine to be using WITNESS. Yes, I was running a kernel for a short while w/ INVARIANTS and WITNESS, bu= t=20 it was basically useless after a couple of hours under load under the giant= =20 lock. How much of a performance hit is just WITNESS? (I also got a "me too" message from someone privately who experianced the s= ame=20 issue after a 5.1->5.2 update) =2D -Peter =2D --=20 Peter_Losher@isc.org | ISC | OpenPGP 0xE8048D08 | "The bits must flow" =2D----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (FreeBSD) iD8DBQFAFuQUPtVx9OgEjQgRAlR1AJwJJ6lFXLgQjX0uwGTnUicCAjx9PwCgs1Q5 v9iUdxy7mvKGloxNMrwb7so=3D =3DxyWP =2D----END PGP SIGNATURE-----