On Tue, 30 Jan 2001, Gordon Rowell wrote:
> On Tue, Jan 30, 2001 at 08:30:21PM -0500, Charlie Brady <[EMAIL PROTECTED]> wrote:
> >
> > On Mon, 29 Jan 2001, Glenn Kennedy wrote:
> >
> > > how should the pptp server perform when transferring files as compared
> > > to ftp? how dependent is it on processor power? i'm noticing painfully
> > > slow file transfer performance (probably less than 10% of ftp speed
> > > for the same files). my e-smith server is a p150 running 4.1b3. is
> > > this a potential bug/misconfiguration or just the nature of pptp?
> >
> > The nature of PPTP. It is a horrible protocol. It is especially vulnerable
> > to dropped packets.
>
> P150s also take a while to chew over encryption protocols - compare
> the SSH login time of a P133 with a PIII 450 (now considered slow).
> Encryption is one those cases in which a bigger sledgehammer is likely
> to show returns.
Certainly true. But I doubt that it explains the 10fold change.
I should add that PPTP is also vulnerable to out of order packet
arrival. Packets which arrive early more or less cause all the late
packets to be discarded. The most recent pptpd daemon does do some packet
re-ordering, to ameliorate this a little.
--
Charlie Brady [EMAIL PROTECTED]
http://www.e-smith.org (development) http://www.e-smith.com (corporate)
Phone: +1 (613) 368 4376 or 564 8000 Fax: +1 (613) 564 7739
e-smith, inc. 1500-150 Metcalfe St, Ottawa, ON K2P 1P1 Canada
