Date: Mon, 18 Jun 2001 12:34:53 +0200 From: "Karsten W. Rohrbach" <karsten@rohrbach.de> To: Dag-Erling Smorgrav <des@ofug.org> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: Article Network performance by OS Message-ID: <20010618123453.B89983@mail.webmonster.de> In-Reply-To: <xzpithv8xn8.fsf@flood.ping.uio.no>; from des@ofug.org on Sun, Jun 17, 2001 at 07:48:27AM %2B0200 References: <Pine.LNX.4.21.0106162345400.2056-100000@imladris.rielhome.conectiva> <xzpithv8xn8.fsf@flood.ping.uio.no>
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Dag-Erling Smorgrav(des@ofug.org)@2001.06.17 07:48:27 +0000:
> Rik van Riel <riel@conectiva.com.br> writes:
> > Not quite. Linux distributions tend to be extremely
> > conservative in the IDE options (DMA, interrupt unmasking,
> > write caching, etc. all disabled) while FreeBSD seems to
> > have write caching and DMA on by default...
>=20
> Ahem.
>=20
> First of all, Linux' file system (ext2fs) is more or less equivalent,
> in terms of performance and integrity, to async ffs. This gives Linux
> a big performance edge out of the box, and FreeBSD a big reliability
> edge - but benchmark authors rarely care about fs integrity, as
> shutting off the power during heavy disk I/O isn't generally part of
> their benchmark.
well, IMVHO, it should be ;-)
>=20
> Second, we tried turning write caching on ATA drives off by default,
> and boy were you (the user community) pissed. Yes, turning wc off
> shows you just how crappy those non-tagged-queueing 4000 RPM ATA
> drives you picked up at Fry's for some pocket change are. So we
> turned it back on. If you're not happy with that, put 'hw.ata.wc=3D"0"'
> in your /boot/loader.conf and they'll be off after the next reboot.
> Or get real disks.
that's one for the handbook, eh? imagine:
Q: i got problem {...}, it seems to depend on (ATA|IDE|disk|drive|...)
A: get real hardware, you're running a production system, aren't you?
it would be a nice thing[tm] to have such stuff in the docs.
/k
--=20
> Zero Defects, n.: The result of shutting down a production line.=20
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