Date: Wed, 13 Nov 2002 14:41:26 +0100 (CET) From: Tomas Pluskal <plusik@pohoda.cz> To: Bruce Evans <bde@zeta.org.au> Cc: Terry Lambert <tlambert2@mindspring.com>, <freebsd-fs@FreeBSD.ORG> Subject: Re: seeking help to rewrite the msdos filesystem Message-ID: <Pine.LNX.4.30L2.0211131438470.21547-100000@pohoda.cz>
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> The problem here seems to be just that some drives don't have any > significant buffering and/or have huge command overheads, so even the > ffs default block size of 16K is too small. The msdosfs default block > size of 2K for ZIP drives is far too small. Clustering increases the > effective block size to 64K, which is large enough for most purposes, > but mdosfs is missing the few lines of code needed to implement > clustering, and read-ahead doesn't help since it is done in units of > the too-small block size. This is an old problem, but mostly finished > going away about 7 years when adequate buffering and/or firmware to > manage it became normal in all ordinary disk drives. Could you please write a liitle more about those "missing few lines of code" ? I think it is what I could do and what would help when using ZIP drives and digital cameras etc.. Thanks Tomas Pluskal To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message
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