Date: Sat, 19 Dec 2009 00:47:53 -0500 From: Zaphod Beeblebrox <zbeeble@gmail.com> To: freebsd-hackers@freebsd.org Subject: scp more perfectly fills the pipe than NFS/TCP Message-ID: <5f67a8c40912182147t1adc158ew9fd3d94c4c4c955f@mail.gmail.com>
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Here's an interesting conundrum. I don't know what's different between the TCP that scp uses from the TCP that NFS uses, but given the same two FreeBSD machines, SCP fills the pipe with packets better. Examine the following graphic: http://www.eicat.ca/~dgilbert/example-mrtg.png The system doing the scp and the NFS server is FreeBSD-7.2-p1. The system receiving the scp and the NFS client is FreeBSD-8.0-p1 The scp transfer is the left hand side of the graph and the NFS transfer is on the right. The NFS is mounted with "-3 -T -b -l -i" and no other options. Files are being moved over NFS with the system "mv" command. The files in each case are large (50 to 500 meg files). The connection is a DSL that terminates on the local lan near the server (I own and run the DSL and the ISP) In either case, the connection is lightly used by only me --- and I'm fairly certain that this isn't another network factor at play.
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