Date: Wed, 7 Jun 2000 17:08:44 -0400 (EDT) From: Mikhail Teterin <mi@privatelabs.com> To: stable@freebsd.org Subject: changes in dd? Message-ID: <200006072108.RAA94211@misha.privatelabs.com>
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Hello! I'm noticing a big difference between two -stable machines: 0: 4.0-STABLE #1: Wed Apr 19 14:11:58 EDT 2000 1: 4.0-STABLE #2: Fri Jun 2 16:53:15 EDT 2000 My application needs to save files on the remote servers and I chose to do it using dd, because I could tell it exactly how many bytes to read and save without relying on the EOF. My command line is: ssh -o'Compression no' -e none -c blowfish <server> \ dd ibs=1 count=<size> of=/dev/null < /kernel.GENERIC This works on both machines, but on the newer one it is much slower then on the older one (51 Kb/sec vs. 3Mb/sec !). If I remove ``ibs=1 count=<size>'' the speed is the same, but I can't specify the size any more. May be, it is not even dd, but something else in the system... To work around I wrote my own little program, but I'm still curious what changed in the system for such a dramatic difference... TIA, -mi To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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