Date: Tue, 2 Oct 2001 17:59:48 +0200 (CEST) From: Egervary Gergely <mauzi@faber.poli.hu> To: <freebsd-hackers@freebsd.org> Subject: newbie question: filesystem i/o Message-ID: <Pine.LNX.4.30.0110021739060.25456-100000@faber.poli.hu>
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hi hackers, I'm quite new to FreeBSD but not in UN*X, please let me ask a question: I wonder that the filesystem performance under FreeBSD is so great. I'm doing disk-to-disk file copies, like ``dd if=file1 of=file2 bs=64k'' and the performance is much better than on other unices. Other systems use 16k or 64k (or whatever MAXBSIZE is set to) chunks for sequential i/o, and the disk seeks like an evil. On FreeBSD, the disk seeks _much_ less. probably FreeBSD is re-blocking the (contigous?) chunks, and does i/o with huge blocks like several megabytes? How is it done technically? Is it the filesystem, or the VM? could someone enlighten me please? :) cheers, -- mauzi To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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