From owner-freebsd-current@FreeBSD.ORG Wed Jan 28 18:21:30 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 3F12616A4CE; Wed, 28 Jan 2004 18:21:30 -0800 (PST) Received: from farside.isc.org (farside.isc.org [204.152.187.5]) by mx1.FreeBSD.org (Postfix) with ESMTP id 4C80143D1D; Wed, 28 Jan 2004 18:21:29 -0800 (PST) (envelope-from Peter_Losher@isc.org) Received: from tardis-v6.roam.isc.org (tardis-v6.roam.isc.org [IPv6:2001:4f8:3:e:209:5bff:fe4b:b277]) (using TLSv1 with cipher RC4-MD5 (128/128 bits)) (No client certificate requested) by farside.isc.org (Postfix) with ESMTP id 99A60A82B; Thu, 29 Jan 2004 02:21:28 +0000 (UTC) (envelope-from Peter_Losher@isc.org) From: Peter Losher Organization: ISC To: John Baldwin Date: Wed, 28 Jan 2004 18:21:26 -0800 User-Agent: KMail/1.5.94 References: <20040127082106.L14045@farside.isc.org> <200401271420.05240.Peter_Losher@isc.org> <200401281243.10655.jhb@FreeBSD.org> In-Reply-To: <200401281243.10655.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: <200401281821.26324.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: Thu, 29 Jan 2004 02:21:30 -0000 =2D----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Wednesday 28 January 2004 09:43 am, John Baldwin wrote: > > Yes, I was running a kernel for a short while w/ INVARIANTS and > > WITNESS, but it was basically useless after a couple of hours under > > load under the giant lock. How much of a performance hit is just > > WITNESS? > > A lot. I think Robert Watson has seen as high a performance impact as > 40%. Oh joy - that's a non-starter... :( And it just happened again: =2D -=3D- spin lock sched lock held by 0x8d2f7a00 for > 5 seconds panic: spin lock held too long cpuid =3D 4; Debugger("panic") Stopped at Debugger+0x55: xchgl %ebx,in_Debugger.0 db> =2D -=3D- If there is anything else I can provide that doesn't make the system slow=20 as molassess to help debug, I am all ears.=20 Best Wishes - Peter =2D --=20 Peter_Losher@isc.org | ISC | OpenPGP Key E8048D08 | "The bits must flow" =2D----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.3 (FreeBSD) iD8DBQFAGG4mPtVx9OgEjQgRAmvtAJ0effqPznHB65bWog9hfm8+WzzZIgCgxctn ++EFx1TJ+q63ErM6oFmy1O8=3D =3DLapX =2D----END PGP SIGNATURE-----