Date: Wed, 12 Dec 2012 09:43:10 +1100 From: Peter Jeremy <peter@rulingia.com> To: Dieter BSD <dieterbsd@engineer.com> Cc: freebsd-hackers@freebsd.org Subject: Re: FreeBSD for serious performance? Message-ID: <20121211224310.GB35245@server.rulingia.com> In-Reply-To: <20121211204323.310760@gmx.com> References: <20121211204323.310760@gmx.com>
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--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 <dieterbsd@engineer.com> 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--
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