Date: Wed, 13 Nov 2002 09:55:51 +0100 (CET) From: Tomas Pluskal <plusik@pohoda.cz> To: Terry Lambert <tlambert2@mindspring.com> Cc: <freebsd-fs@freebsd.org> Subject: Re: seeking help to rewrite the msdos filesystem Message-ID: <Pine.LNX.4.30L2.0211130955140.13142-100000@pohoda.cz>
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> > This has more to do with sequential access. Technically, you can > read a FAT cluster at a time instead of an FS block at a time, and > you will achieve some multiplier on sequential access, but you will > find that under load, that the fault rate for blocks will go up. When I read from my ZIP drive, according to iostat the request size is 2KB. When I run dd with 2KB request size: # dd if=/dev/afd0 of=/dev/null bs=2048 count=100 100+0 records in 100+0 records out 204800 bytes transferred in 2.127448 secs (96266 bytes/sec) If I understand this right, I can never get faster then 96KB/s with sequential access, when using 2KB requests ? It is quite slow :) Tomas Pluskal To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message
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