Date: Fri, 13 Aug 1999 15:39:25 +0200 From: Poul-Henning Kamp <phk@critter.freebsd.dk> To: Jos Backus <Jos.Backus@nl.origin-it.com> Cc: Bruce Evans <bde@zeta.org.au>, vernick@bell-labs.com, freebsd-fs@FreeBSD.ORG Subject: Re: Help with understand file system performance Message-ID: <3324.934551565@critter.freebsd.dk> In-Reply-To: Your message of "Fri, 13 Aug 1999 15:25:29 %2B0200." <19990813152529.G12312@hal.mpn.cp.philips.com>
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In message <19990813152529.G12312@hal.mpn.cp.philips.com>, Jos Backus writes: >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. AIX uses jfs, which is entirely diffrenet. It may be time to abandon the concept of fragments. "cylinders" should be taken out of "cylindergroups". -- Poul-Henning Kamp FreeBSD coreteam member phk@FreeBSD.ORG "Real hackers run -current on their laptop." FreeBSD -- It will take a long time before progress goes too far! To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message
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