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Date:      Fri, 24 Jul 2015 00:23:05 +0000
From:      Glen Barber <gjb@FreeBSD.org>
To:        Michelle Sullivan <michelle@sorbs.net>
Cc:        Jason Unovitch <jason.unovitch@gmail.com>, freebsd-stable@freebsd.org, herbert@oslo.ath.cx
Subject:   Re: 10.2-Beta i386..what's wrong..?
Message-ID:  <20150724002305.GL84931@FreeBSD.org>
In-Reply-To: <55B18488.9060602@sorbs.net>
References:  <55B17B7A.4080402@gmail.com> <20150723234805.GK84931@FreeBSD.org> <55B18488.9060602@sorbs.net>

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On Fri, Jul 24, 2015 at 02:19:20AM +0200, Michelle Sullivan wrote:
> Glen Barber wrote:
> >
> > ZFS on i386 requires KSTACK_PAGES=3D4 in the kernel configuration to wo=
rk
> > properly, as noted in the 10.1-RELEASE errata (and release notes, if
> > I remember correctly).
> >
> > We cannot set KSTACK_PAGES=3D4 in GENERIC by default, as it is too
> > disruptive. =20
>=20
> Why?
>=20

Because it takes resources away from userland threads.

> > If you are using ZFS on i386, you *must* build your own
> > kernel for this.  It is otherwise unsupported by default.
> >  =20
> Why is zfs on i386 so hard?  Why is it even in the GENERIC kernel if
> it's unsupported?
>=20

It is not in GENERIC by default.  You have to specifically kldload(8)
zfs.ko.

Glen


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