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 <free...@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.
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
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