From owner-freebsd-current@FreeBSD.ORG Mon May 3 11:22:13 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 022CD16A4CE for ; Mon, 3 May 2004 11:22:13 -0700 (PDT) Received: from dan.emsphone.com (dan.emsphone.com [199.67.51.101]) by mx1.FreeBSD.org (Postfix) with ESMTP id 94BC343D5F for ; Mon, 3 May 2004 11:22:10 -0700 (PDT) (envelope-from dan@dan.emsphone.com) Received: (from dan@localhost) by dan.emsphone.com (8.12.10/8.12.10) id i43IM8Xm001423; Mon, 3 May 2004 13:22:08 -0500 (CDT) (envelope-from dan) Date: Mon, 3 May 2004 13:22:08 -0500 From: Dan Nelson To: Andrew Gallatin Message-ID: <20040503182208.GB14109@dan.emsphone.com> References: <200404301403.50634.past@noc.ntua.gr> <20040430123040.GB30157@melusine.cuivre.fr.eu.org> <20040430211948.GC85783@dragon.nuxi.com> <16534.21617.310294.982202@grasshopper.cs.duke.edu> <20040503145519.GA74546@troutmask.apl.washington.edu> <16534.31685.83954.524728@grasshopper.cs.duke.edu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <16534.31685.83954.524728@grasshopper.cs.duke.edu> X-OS: FreeBSD 5.2-CURRENT X-message-flag: Outlook Error User-Agent: Mutt/1.5.6i cc: freebsd-current@freebsd.org cc: Steve Kargl Subject: Re: partial dumps (was Re: Change default dumpdir to /usr/crash?) 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: Mon, 03 May 2004 18:22:13 -0000 In the last episode (May 03), Andrew Gallatin said: > Brad Knowles writes: > > At 7:55 AM -0700 2004/05/03, Steve Kargl wrote: > > > I would support the integration of the changes. With dual > > > opteron systems capacities of 16 to 24 GB of memory, partial > > > dump goes from a "nice to have feature" to a "we need this > > > feature." > > > > Hmm. What about compressed dumps? Or are we doing that already? > > savecore -z > > This would help with /var sizes, but you'd still need a dump device > as large as physmem. That's compressed vmcores :) For compressed dumps, see http://dan.allantgroup.com/FreeBSD/ . It's more than a proof-of-concept (I use it on multiple systems), but is not committable as is (see comments at the top of the diff). The ability to do kmem-only sparse dumps would reduce the necessity of true compressed dumps. -- Dan Nelson dnelson@allantgroup.com