Date: Mon, 31 May 2010 11:45:25 -0700 From: Jeremy Chadwick <freebsd@jdc.parodius.com> To: Dave Hayes <dave@jetcafe.org> Cc: Garrett Cooper <yanefbsd@gmail.com>, freebsd-stable@freebsd.org, Clifton Royston <cliftonr@lava.net>, jhb@freebsd.org Subject: Re: Locking a file backed mdconfig into memory Message-ID: <20100531184525.GA89545@icarus.home.lan> In-Reply-To: <201005311825.o4VIPp5F051573@hugeraid.jetcafe.org> References: <201005272348.o4RNmgWh014243@hugeraid.jetcafe.org> <20100528043006.GA18560@lava.net> <201005281757.o4SHvTwq020905@hugeraid.jetcafe.org> <20100528191828.GA83371@icarus.home.lan> <201005281926.o4SJQCW3041849@hugeraid.jetcafe.org> <20100528215837.GA86689@icarus.home.lan> <AANLkTikq8AJIlvIkWkGIaS6mlqWOAPreVY7ALs3AO98v@mail.gmail.com> <201005310242.o4V2glZX057087@hugeraid.jetcafe.org> <20100531041843.GA66732@icarus.home.lan> <201005311825.o4VIPp5F051573@hugeraid.jetcafe.org>
next in thread | previous in thread | raw e-mail | index | archive | help
On Mon, May 31, 2010 at 11:25:51AM -0700, Dave Hayes wrote: > Jeremy Chadwick <freebsd@jdc.parodius.com> 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. -- | Jeremy Chadwick jdc@parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20100531184525.GA89545>