Date: 17 Jun 2001 07:48:27 +0200 From: Dag-Erling Smorgrav <des@ofug.org> To: Rik van Riel <riel@conectiva.com.br> Cc: Jonathan Fortin <jfortin@akalink.com>, freebsd-chat@FreeBSD.ORG, freebsd-hackers@FreeBSD.ORG Subject: Re: Article Network performance by OS Message-ID: <xzpithv8xn8.fsf@flood.ping.uio.no> In-Reply-To: <Pine.LNX.4.21.0106162345400.2056-100000@imladris.rielhome.conectiva> References: <Pine.LNX.4.21.0106162345400.2056-100000@imladris.rielhome.conectiva>
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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... Ahem. 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. 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="0"' in your /boot/loader.conf and they'll be off after the next reboot. Or get real disks. DES -- Dag-Erling Smorgrav - des@ofug.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-chat" in the body of the message
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