linux-kernel - Stupid kexec/kdump question...

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Message-Id: <200609261525.k8QFP6j4022389@turing-police.cc.vt.edu>
Date:	Tue, 26 Sep 2006 11:25:06 -0400
From:	Valdis.Kletnieks@...edu
To:	linux-kernel@...r.kernel.org
Subject: Stupid kexec/kdump question...

OK, I'm running a Fedora Core 6 (rawhide actually) box with -18-mm1 kernel.
I've installed kexec-tools and similar, and am trying to get the kernels
built following the hints in Documentation/kdump/kdump.txt, but a few
questions arise:

1) Other than the fact that the Fedora userspace looks for a ${kernelvers}kdump
kernel, is there any reason the kdump kernel has to match the running one, or
can an older kernel be used?

2) I'm presuming that a massively stripped down kernel (no sound support,
no netfilter, no etc) that just has what's needed to mount the dump location
is sufficient?

3) The docs recommend 'crashkernel=64M@...', but that's 8% of my memory.
What will happen if I try '16M@...' instead?  Just slower copying due to
a smaller buffer cache space, or something more evil?

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