From owner-freebsd-stable@FreeBSD.ORG Fri May 20 13:15:46 2005 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 59EA916A4CE for ; Fri, 20 May 2005 13:15:46 +0000 (GMT) Received: from relay.bestcom.ru (relay.bestcom.ru [217.72.144.5]) by mx1.FreeBSD.org (Postfix) with ESMTP id 879E343D91 for ; Fri, 20 May 2005 13:15:41 +0000 (GMT) (envelope-from glebius@FreeBSD.org) Received: from cell.sick.ru (root@cell.sick.ru [217.72.144.68]) by relay.bestcom.ru (8.13.1/8.12.9) with ESMTP id j4KDFb3E082788 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=FAIL); Fri, 20 May 2005 17:15:38 +0400 (MSD) (envelope-from glebius@FreeBSD.org) Received: from cell.sick.ru (glebius@localhost [127.0.0.1]) by cell.sick.ru (8.13.1/8.12.8) with ESMTP id j4KDFbGJ030486 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Fri, 20 May 2005 17:15:37 +0400 (MSD) (envelope-from glebius@FreeBSD.org) Received: (from glebius@localhost) by cell.sick.ru (8.13.1/8.13.1/Submit) id j4KDFaaX030485; Fri, 20 May 2005 17:15:36 +0400 (MSD) (envelope-from glebius@FreeBSD.org) X-Authentication-Warning: cell.sick.ru: glebius set sender to glebius@FreeBSD.org using -f Date: Fri, 20 May 2005 17:15:36 +0400 From: Gleb Smirnoff To: Jeremie Le Hen Message-ID: <20050520131536.GA30219@cell.sick.ru> References: <20050515120007.GA777@obiwan.tataz.chchile.org> <20050518155130.H87264@carver.gumbysoft.com> <20050519125639.GK818@obiwan.tataz.chchile.org> <20050520080435.GB26938@cell.sick.ru> <20050520131031.GU818@obiwan.tataz.chchile.org> Mime-Version: 1.0 Content-Type: text/plain; charset=koi8-r Content-Disposition: inline In-Reply-To: <20050520131031.GU818@obiwan.tataz.chchile.org> User-Agent: Mutt/1.5.6i X-Virus-Scanned: ClamAV version devel-20050125, clamav-milter version 0.80ff on relay.bestcom.ru X-Virus-Status: Clean cc: freebsd-stable@FreeBSD.org Subject: Re: panic in recent RELENG_5 tcp code path X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 20 May 2005 13:15:46 -0000 Jeremie, On Fri, May 20, 2005 at 03:10:32PM +0200, Jeremie Le Hen wrote: J> > according to the fact that the panic occured in dereferncing mbuf pointer J> > your kernel is compiled without INVARIANTS. J> > J> > Please compile it with INVARIANTS. This will probably help to trigger panic J> > earlier, and it will be more clear. J> J> a quick look at src/conf/NOTES reveals the following : J> %%% J> # J> # The INVARIANTS option is used in a number of source files to enable J> # extra sanity checking of internal structures. This support is not J> # enabled by default because of the extra time it would take to check J> # for these conditions, which can only occur as a result of J> # programming errors. J> # J> %%% J> J> I'm going to recompile my kernel with INVARIANTS but I wonder in J> which order of magniture it will slow my kernel down. In other words, J> what does INVARIANTS do concretely, shall I expect a performance drop J> like WITNESS does ? No. The performance loss is _much_ less significant than in WITNESS case. You probably will not notice it. -- Totus tuus, Glebius. GLEBIUS-RIPN GLEB-RIPE