On Fri, 10 Sep 1999, David L. Nicol wrote:
|Clifford Kite wrote:
|
|> VJ does improve the PPP link transfer, although it's of less
|> importance nowadays with modem compression.
|
|My router is not a speed demon. Might turning off VJ help with
|load as well? Does VJ add much cpu load or is it good? How do I
I wouldn't recommend turning it off unless there are errors that can be
traced to it. The CPU time that it requires is likely miniscule as a
percent of total CPU time. The software modems (Winmodem, HFC, HSP)
wouldn't be accepted if the load they put on the CPU was very noticeable
and that load is undoubtedly much more than VJ compression.
|read the VJ lines in pppstats output? It seems that the sum
|of *VJ* is larger than PACK in many lines.
I'd never used pppstats and had to clear some hurdles before replying,
which is the reason that this reply is so late. So I haven't done much
testing, but such testing as I did do didn't ever show that the number of
packets (PACK) exceeded VJCOMP + VJUNC, which is the total number of TCP
packets received or transmitted.
The only pppstat bug that was apparent to me was that the sampling time
without the -w option was not 5 seconds, pppstats show one instance and
quit.
It does look like I'm going to read the RFC for VJ compression, at least
the overview. I feel uncomfortable answering questions like this without
at least doing that, even though I feel strongly that the answer as to CPU
loading is correct.
---
Clifford Kite Not a guru. (tm)
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