Date: Fri, 8 Dec 1995 11:34:44 -0700 From: Nate Williams <nate@rocky.sri.MT.net> To: "Jordan K. Hubbard" <jkh@time.cdrom.com> Cc: "Michael C. Newell" <mnewell@lupine.nsi.nasa.gov>, Joe Greco <jgreco@brasil.moneng.mei.com>, Angelo Turetta <turetta@trust.stylo.it>, freebsd-hackers@freebsd.org Subject: Re: User space PPP & leased line Message-ID: <199512081834.LAA00699@rocky.sri.MT.net> In-Reply-To: <28835.818443536@time.cdrom.com> References: <Pine.SUN.3.91.951208112808.17619E-100000@lupine.nsi.nasa.gov> <28835.818443536@time.cdrom.com>
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> > One thing we DID notice was that the transfer speeds using the user mode > > code were SIGNIFICANTLY higher than those using the kernel mode code - > > for example, transferring a medium size binary file (one that could be > > fully transferred in < 2 minutes :-) using pppd takes an average of > > 2.3KB/s whereas with ijppp it's more like 3.3KB/s (using a V.fc modem > > connection at 26.4Kb/s). I'm not sure why this should be, but given the > > That's also worth investigating. I can't see any inefficiency that > should result in *that* much slowdown, and my own tests showed > virtually no difference between the two In a word, 'Predictor-1 compression'. It's available on ijppp, and not with kernel-mode ppp and makes a significant difference. Nate
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