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From: Volodymyr Kostyrko <c.kworr@gmail.com>
Subject: Re: clang compiled kernel panic when mounting zfs root on i386
Date: Thu, 20 Dec 2012 13:18:22 +0200
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Cc: freebsd-current@FreeBSD.org, Dimitry Andric <dim@FreeBSD.org>,
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18.12.2012 00:20, Andriy Gapon:
> It's been already mentioned many times that ZFS works much better on amd64.
> It's up to a (potential) user to understand limitations of i386 and to decide
> whether to use ZFS, in what situations and how.
>
> You may want to consider using KSTACK_PAGES=4 in your kernel configuration.

For last two fays my system seems stable on kernel compiled with 
KSTACK_PAGES=4 and WITH_CLANG_IS_CC.

-- 
Sphinx of black quartz, judge my vow.