Date: Sun, 6 Jul 2008 12:43:19 +0100 (BST) From: Robert Watson <rwatson@FreeBSD.org> To: Matthias Apitz <matthias.apitz@oclc.org> Cc: freebsd-hackers@freebsd.org Subject: Re: kernel HEAD && userland 7.0-REL? Message-ID: <20080706124135.C44832@fledge.watson.org> In-Reply-To: <20080704124227.GA10264@rebelion.Sisis.de> References: <20080704124227.GA10264@rebelion.Sisis.de>
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On Fri, 4 Jul 2008, Matthias Apitz wrote: > I'm running a RELENG_7 kernel and a userland as 7.0-REL on one of my > laptops; I've been asked to check if a given driver problem in RELENG_7 is > as well with HEAD... can I update the kernel to HEAD and let the userland > (and all my compiled ports) as 7.0-REL; I know that this is not the > intention, but it would cost me a lot of work if I should compile as well > ~200 ports.... As a general rule, running old userspace on a new kernel works pretty well, but you should expect certain types of things to not work -- for example, monitoring tools that expect the kernel layout of data structures to be unchanged. Within a particular -STABLE branch this is a bit less volatile, but as you go from, say, 6-STABLE to a 7-STABLE kernel, the chances that some of the more obscure options to netstat, etc, will not work are pretty high. Likewise, be careful to disable any third-party kernel modules that may require recompiling but aren't caught by the base system build, or you'll get a nasty surprise when they panic. :-) Robert N M Watson Computer Laboratory University of Cambridge
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