Date: Fri, 13 Aug 1999 15:25:29 +0200 From: Jos Backus <Jos.Backus@nl.origin-it.com> To: Bruce Evans <bde@zeta.org.au> Cc: phk@critter.freebsd.dk, vernick@bell-labs.com, freebsd-fs@FreeBSD.ORG Subject: Re: Help with understand file system performance Message-ID: <19990813152529.G12312@hal.mpn.cp.philips.com> In-Reply-To: <199908131313.XAA14647@godzilla.zeta.org.au>; from Bruce Evans on Fri, Aug 13, 1999 at 11:13:21PM %2B1000 References: <199908131313.XAA14647@godzilla.zeta.org.au>
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On Fri, Aug 13, 1999 at 11:13:21PM +1000, Bruce Evans wrote:
[Poul-Henning wrote:]
> >Try fiddling the newfs parameters. I see 17% speedup using:
> >
> > newfs -b 16384 -f 4096 -c 100
Too bad tunefs doesn't have those options :-)
> ffs-4K-4K is only slightly faster than ffs-8K-1K now, presumably because
> drive caches are larger and command overheads are relatively higher (the KA
> acts like a slow SCSI drive in wanting a block size of at least 8K to keep
> up with the disk).
As an aside, AIX uses 4K blocks and doesn't support fragments.
--
Jos Backus _/ _/_/_/ "Reliability means never
_/ _/ _/ having to say you're sorry."
_/ _/_/_/ -- D. J. Bernstein
_/ _/ _/ _/
Jos.Backus@nl.origin-it.com _/_/ _/_/_/ use Std::Disclaimer;
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