Date: Fri, 24 Jul 2015 01:00:03 +0000 From: Glen Barber <gjb@FreeBSD.org> To: Michelle Sullivan <michelle@sorbs.net> Cc: Mark Linimon <linimon@lonesome.com>, Brandon Allbery <allbery.b@gmail.com>, freebsd-stable <freebsd-stable@freebsd.org>, Jason Unovitch <jason.unovitch@gmail.com>, herbert@oslo.ath.cx Subject: Re: 10.2-Beta i386..what's wrong..? Message-ID: <20150724010003.GO84931@FreeBSD.org> In-Reply-To: <55B18CA8.1020909@sorbs.net> References: <55B17B7A.4080402@gmail.com> <20150723234805.GK84931@FreeBSD.org> <55B18488.9060602@sorbs.net> <20150724004026.GA1370@lonesome.com> <CAKFCL4VVtLspj%2BRQxSHjyQxAhixPuMiQoehoA2MYWeSgqTTwAQ@mail.gmail.com> <20150724004343.GM84931@FreeBSD.org> <20150724004443.GC1370@lonesome.com> <20150724004939.GN84931@FreeBSD.org> <55B18CA8.1020909@sorbs.net>
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--V7BlxAaPrdhzdIM1 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Jul 24, 2015 at 02:54:00AM +0200, Michelle Sullivan wrote: > Glen Barber wrote: > > On Thu, Jul 23, 2015 at 07:44:43PM -0500, Mark Linimon wrote: > > =20 > >> On Fri, Jul 24, 2015 at 12:43:43AM +0000, Glen Barber wrote: > >> =20 > >>> Even on amd64, you need to tune the system with less than 4GB RAM. > >>> =20 > >> The only correct answer to "how much RAM do you need to run ZFS" is > >> "always more" AFAICT. > >> > >> =20 > > > > There's a bit more to it than that. You *can* successfully run amd64 > > ZFS system with certain tunings (vfs.kmem_max IIRC), but you also need > > to adjust things like disabling prefetching with less than 4GB RAM > > (accessible to the OS). > > > > So yeah, "more RAM" is always a thing in this playing field. > > > > Glen > > > > =20 > Actually I'm quite sucessfully running zfs on i386 (in a VM) ... here's > the trick (which leads me to suspect ARC handling as the problem) - when > I get to 512M of kernel space or less than 1G of RAM available system > wide, I export/import the zfs pool... Using this formula I have uptimes > of months... I haven't yet tried the 'ARC patch' that was proposed > recently... >=20 Which FreeBSD version is this? Things changed since 10.1-RELEASE and what will be 10.2-RELEASE enough that I can't even get a single-disk ZFS system (in VirtualBox) to boot on i386. During 10.1-RELEASE testing, I only saw problems with multi-disk setup (mirror, raidzN), but the FreeBSD kernel grew since 10.1-RELEASE, so this is not unexpected. Glen --V7BlxAaPrdhzdIM1 Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIcBAEBCAAGBQJVsY4MAAoJEAMUWKVHj+KT8cgP/iQ4C8gNdfJrh/7TA9IXZMT6 TWpgSh6L+Xun3t4FhzyR8dgdd/Qdz5XoWvarMYjlFd1WpSFvCsfns1PxdH2NbuY0 DmZHXmwmH8E2gR8AwyjWHFvGOR2X5U0jH/7zd6KefmBj79FGwpAcCNIG1I8QZWkW x5PyOjHpLI3HklsLT5XQE72z5aX09KngUqWzeiE20EHNlPeaAg3YWFDQxDCp8g2K ufCF9N52DJqsZWJE/ChoSc6IpzFS5hEeUUkEsmT+M3Ja+ZWszjyvmMFlqmRz0QrE iww7gPfkEWZ/UnIi2AOn7SsYGu3GuOgngH9zSGluSZ5D7hfsyYyBPL74/bceFKCR +RpVxYb/mWgejIHk2eDTb8ej/a1SdgI6xVTpvpYP0s/aFfIg1MKHdX6I6vR5534H BCQq+B6awRudz1CpMqo8B/1o+tQ4TYBzdPL0tzho20yuViKygaYSGJA3bYiR0v7D 0zG2Gej9A/jaMQOQ1P3DozTxxRBjLOueLa0+t7N9FUhTVOnjEnNxkN8cbUXemlKn +Qj30cc54BJ6DdPbczEsqUmalKECfb/xONzeBJbYvopZpp7kaSuBizvGP9cf0yXj BtLyXVB5FaTH2xg1x7lr5B0RINOJlD3e5OIznpkyqeOng5E67+DTZIpE3CteWvJU taoDX4/tmru1gKI557uC =O5A2 -----END PGP SIGNATURE----- --V7BlxAaPrdhzdIM1--
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