From owner-freebsd-stable@freebsd.org Fri Jul 24 00:49:41 2015 Return-Path: Delivered-To: freebsd-stable@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id E42E69A9B14 for ; Fri, 24 Jul 2015 00:49:41 +0000 (UTC) (envelope-from gjb@FreeBSD.org) Received: from freefall.freebsd.org (freefall.freebsd.org [IPv6:2001:1900:2254:206c::16:87]) by mx1.freebsd.org (Postfix) with ESMTP id CE0C91132; Fri, 24 Jul 2015 00:49:41 +0000 (UTC) (envelope-from gjb@FreeBSD.org) Received: from FreeBSD.org (freefall.freebsd.org [IPv6:2001:1900:2254:206c::16:87]) by freefall.freebsd.org (Postfix) with ESMTP id 02B8F1814; Fri, 24 Jul 2015 00:49:40 +0000 (UTC) (envelope-from gjb@FreeBSD.org) Date: Fri, 24 Jul 2015 00:49:39 +0000 From: Glen Barber To: Mark Linimon Cc: Brandon Allbery , Michelle Sullivan , freebsd-stable , Jason Unovitch , herbert@oslo.ath.cx Subject: Re: 10.2-Beta i386..what's wrong..? Message-ID: <20150724004939.GN84931@FreeBSD.org> References: <55B17B7A.4080402@gmail.com> <20150723234805.GK84931@FreeBSD.org> <55B18488.9060602@sorbs.net> <20150724004026.GA1370@lonesome.com> <20150724004343.GM84931@FreeBSD.org> <20150724004443.GC1370@lonesome.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="tpyx7gKuSYt+mjHM" Content-Disposition: inline In-Reply-To: <20150724004443.GC1370@lonesome.com> X-Operating-System: FreeBSD 11.0-CURRENT amd64 X-SCUD-Definition: Sudden Completely Unexpected Dataloss X-SULE-Definition: Sudden Unexpected Learning Event X-PEKBAC-Definition: Problem Exists, Keyboard Between Admin/Computer User-Agent: Mutt/1.5.23 (2014-03-12) X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 24 Jul 2015 00:49:42 -0000 --tpyx7gKuSYt+mjHM Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Jul 23, 2015 at 07:44:43PM -0500, Mark Linimon wrote: > On Fri, Jul 24, 2015 at 12:43:43AM +0000, Glen Barber wrote: > > 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 --tpyx7gKuSYt+mjHM Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIcBAEBCAAGBQJVsYujAAoJEAMUWKVHj+KTlWcP/RxYnX7Tkgs02S8cvzyOLQ4k lgAgNXF0Dvb4PBwaN1ZOPtRT1m/hzStzwM5nlyH4+g63H/C64WlF8++xJaSVTByr XgAEqJyeOjP0wBQYLvKfWJitXOEpr1BLyYMy/dRj1uXcNYm5X4oLIByxUGl3GJIe tUNiDdDdfxXgFMun9o4dyK/w3jYVw6uGW9tJFD/2fUGv0SMikSS7OkEylVAGL91F Q6Yb4V9ExPsfgr4WEQPVUAEeeSVpWpFyTc+r8FsPe+s3UPRcJYz7jJ4CaWg1kCRP G2EQck/VBX6TsR0JmtdHa9TP0xQSRybsQ6jc2igfq809QrFgYX39f5AwdBM+DzRE H8mBvikgJTNhr5qAzuO3b1eeyvLZArFK7rOc1m9vUxXMINRlCkH9aPvWeGiPhekh 6KEDHlFPhqGlXDI9fG838Mss9FtGW+KjSVJitvfToOBLxzmuTLkHCUbnE8FmW90s o+Yx3CvmcO6zFKjY/GMvJmzspRIOcg0Sha6dvPRAC548VQFP+utcExQPXX4cWzxV s1l9jmqICnOVw+VJncxjPf3xhv0E9c0P2ckZtDQI8ewDGTp4fKiXP5kZkK6ZqxwQ 18uvJMxuU0BaqHjqRFAd5UhCt2HlOg4bsPAj+E/yv/+0n8nZt12mK8qmqhNoC/Zo m1hUdxhX82pFlW7t58Yz =67Nj -----END PGP SIGNATURE----- --tpyx7gKuSYt+mjHM--