From owner-freebsd-hackers@FreeBSD.ORG Tue Dec 11 22:43:24 2012 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 43003FDB for ; Tue, 11 Dec 2012 22:43:24 +0000 (UTC) (envelope-from peter@rulingia.com) Received: from vps.rulingia.com (host-122-100-2-194.octopus.com.au [122.100.2.194]) by mx1.freebsd.org (Postfix) with ESMTP id A52338FC19 for ; Tue, 11 Dec 2012 22:43:23 +0000 (UTC) Received: from server.rulingia.com (c220-239-237-85.belrs5.nsw.optusnet.com.au [220.239.237.85]) by vps.rulingia.com (8.14.5/8.14.5) with ESMTP id qBBMhGKA092191 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Wed, 12 Dec 2012 09:43:16 +1100 (EST) (envelope-from peter@rulingia.com) X-Bogosity: Ham, spamicity=0.000000 Received: from server.rulingia.com (localhost.rulingia.com [127.0.0.1]) by server.rulingia.com (8.14.5/8.14.5) with ESMTP id qBBMhAMh061757 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Wed, 12 Dec 2012 09:43:10 +1100 (EST) (envelope-from peter@server.rulingia.com) Received: (from peter@localhost) by server.rulingia.com (8.14.5/8.14.5/Submit) id qBBMhAdC061754; Wed, 12 Dec 2012 09:43:10 +1100 (EST) (envelope-from peter) Date: Wed, 12 Dec 2012 09:43:10 +1100 From: Peter Jeremy To: Dieter BSD Subject: Re: FreeBSD for serious performance? Message-ID: <20121211224310.GB35245@server.rulingia.com> References: <20121211204323.310760@gmx.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="7AUc2qLy4jB3hD7Z" Content-Disposition: inline In-Reply-To: <20121211204323.310760@gmx.com> X-PGP-Key: http://www.rulingia.com/keys/peter.pgp User-Agent: Mutt/1.5.21 (2010-09-15) Cc: freebsd-hackers@freebsd.org X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 11 Dec 2012 22:43:24 -0000 --7AUc2qLy4jB3hD7Z Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On 2012-Dec-11 15:43:21 -0500, Dieter BSD wrote: >I care about data integrity, so things like ECC are on my must-have list. Well, that's supported by all server CPUs (AMD Opteron, Intel Itanium, Intel Xeon, Oracle/Sun SPARC) and some desktop CPUs (most AMD x86 chips). >A high clock rate doesn't help when some device driver does > >block_all_interrupts(); >while(1) > DELAY(MIGHT_AS_WELL_BE_FOREVER); > >At least four device drivers have caused me to lose data this way. Which device drivers? We can't fix problems we don't know about. >Data integrity, and yes, reliability, that sort of thing. Virtually everything except some embedded and consumer-grade x86 systems manage that. >But without NCQ I'm only getting ~6% of what I should be getting. So, in one sentence you state that ECC is a "must have" and then you complain that that FreeBSD doesn't support NCQ on an old, low-end (consumer-grade) chipset that doesn't support ECC. >It's not some rare, obscure chip. Lots of boxes have it. None that support ECC, so you wouldn't be interested in any of them. >>> I never found a way to boot from different partitions, much less >>> different disks with GPT. Yes, this is a limitation of FreeBSD's GPT loader. So far, no-one has written the code to support multiple boot partitions or disks. Note that most BIOS's allow you to select the boot disk - which is a workaround. --=20 Peter Jeremy --7AUc2qLy4jB3hD7Z Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (FreeBSD) iEYEARECAAYFAlDHtv4ACgkQ/opHv/APuIcm0ACfTErO5FtLBDmMQsIB0ESDgZmH oAgAoLWhNvilwlJ3jO1pE7V/vObi4tZ9 =y975 -----END PGP SIGNATURE----- --7AUc2qLy4jB3hD7Z--