From owner-freebsd-stable@FreeBSD.ORG Tue Jun 1 21:40:17 2010 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 33252106566C for ; Tue, 1 Jun 2010 21:40:17 +0000 (UTC) (envelope-from spork@bway.net) Received: from xena.bway.net (xena.bway.net [216.220.96.26]) by mx1.freebsd.org (Postfix) with ESMTP id DCDBF8FC1C for ; Tue, 1 Jun 2010 21:40:16 +0000 (UTC) Received: (qmail 14497 invoked by uid 0); 1 Jun 2010 21:40:15 -0000 Received: from unknown (HELO ?10.3.2.41?) (spork@96.57.144.66) by smtp.bway.net with (DHE-RSA-AES256-SHA encrypted) SMTP; 1 Jun 2010 21:40:15 -0000 Date: Tue, 1 Jun 2010 17:40:15 -0400 (EDT) From: Charles Sprickman X-X-Sender: spork@hotlap.local To: John Baldwin In-Reply-To: <201006011020.01318.jhb@freebsd.org> Message-ID: References: <201005272348.o4RNmgWh014243@hugeraid.jetcafe.org> <201005311825.o4VIPp5F051573@hugeraid.jetcafe.org> <20100531184525.GA89545@icarus.home.lan> <201006011020.01318.jhb@freebsd.org> User-Agent: Alpine 2.00 (OSX 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Cc: Garrett Cooper , freebsd-stable@freebsd.org, Clifton Royston , Jeremy Chadwick Subject: Re: Locking a file backed mdconfig into memory X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 01 Jun 2010 21:40:17 -0000 On Tue, 1 Jun 2010, John Baldwin wrote: > On Monday 31 May 2010 2:45:25 pm Jeremy Chadwick wrote: >> On Mon, May 31, 2010 at 11:25:51AM -0700, Dave Hayes wrote: >>> Jeremy Chadwick writes: >>>> Is the mfsroot file compressed (.gz extension)? Reason I ask is that >>>> the OP states he's using RELENG_7... >>> >>> Yes it is compressed. >>> >>>> http://jdc.parodius.com/freebsd/pxeboot_serial_install_7.html#step7 >>> >>> Thanks much for this. I did a simple test, I rebuilt a DVD that wasn't >>> booting to use a lower level of compression (gzip -9 to gzip -6) on >>> mfsroot without changing anything else. This caused it to boot normally. >>> >>> I'm not sure it's conclusive evidence, but it certainly looks like a >>> weak datapoint supporting this kernel bug being the source of my >>> problem. >>> >>> Is this problem fixed in 8.0 or by a patch? >> >> With regards to said bug, gzip compression seems to work fine on >> RELENG_8, at least in my experiences: >> >> http://jdc.parodius.com/freebsd/pxeboot_serial_install_8.html >> >> I'm not sure the level of compression is what triggers the bug though; >> I haven't tested all levels (1 through 9). >> >> CC'ing jhb@ since he last updated PR kern/120127 (which I would say is >> still a problem on RELENG_7 :-) ). John, are you aware of any gzip >> decompression / mfsroot changes which might explain the problem on >> RELENG_7? I haven't done a "thorough" series of tests, but on my >> testbed boxes RELENG_8 works fine with a gzip'd mfsroot. > > Ok, if you are using a stock mfsroot from a release build, that should work > fine. If you have built a custom mfsroot that is larger, then you may need to > increase NKPT on i386. In very recent 7 and later you can do this by setting > it to a new value in your kernel config. In older versions you can do this by > manually adding a #define to set a new value of NKPT in opt_global.h or > hacking on the source directly. This is the original post I found confirming all this: http://unix.derkeiler.com/Mailing-Lists/FreeBSD/hackers/2004-02/0241.html I can also confirm your changes that allow it to be a kernel config option works as well. :) It's nice to essentially have a full livefs as your mfsroot for non-sysinstall installs. Charles > -- > John Baldwin > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org" >