Messages in this thread |  | | Subject | Re: 2.0.6 Networking strangeness | Date | Wed, 17 Jul 1996 01:53:34 +0200 (MET DST) | From | "Carsten Paeth" <> |
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> > > > On Mon, 15 Jul 1996 tytso@MIT.EDU wrote: > > > > Date: Sun, 14 Jul 1996 13:37:22 +0300 (EET DST) > > From: Linus Torvalds <torvalds@cs.helsinki.fi> > > > > However, this behaviour makes me suspect more and more that there is > > something broken in the PPP (or serial code) timings, > > > > Well, there is a known problem in the tty layer, which is that upper > > layer processing doesn't happen except on the next clock tick. Hence, > > there is on average a .005 second delay between when the PPP framing > > character comes in and when it actually gets processed. > > I know about this, and I consider it reasonable - it does mean that > latency for serial lines are about 10ms regardless of the speed of the > line, but I don't _really_ consider this a problem (the only place it > shows up is "ping", because TCP should be able to handle it with the > windows anyway for any reasonable speed for the serial line).
I'm not sure, what will happen with faster lines. I'm will get syncron-modems with a converter to async next month, to have a 128Kbit connection over an analog line. (Sure not using normal serial card ...)
I will report.
> > We might want to fix it some day, but that one shouldn't have been the > cause of this (when the delays were on the order of hundreds of ms, > rather than 10ms). And as it turns out, it seems the problem was a false > alarm anyway. > > Linus >
calle -- calle@calle.in-berlin.de
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