Well, that's not SO strange.
Say, a User can send/receive 40'000 bit/s (and that's normally not true, as
v.90 upstream is only 33'600).
So, he can send 40 bits in 1 ms, that's 5 bytes. a linux standard ping is 56
bytes. so he needs 11.2 ms to send 56 bytes. Then, a ping is two-way, so you
have to double that, that's already 22.4 ms. Then, you still don't have any
serial line handling, processing time, protocol stacks, any async to sync
conversion or PPP de- and encapsluation. And of course, you have quite some
overhead to send those 56 bytes (IP-Header, PPP-Header and so on) Then,
there's a good chance that the line isn't totally dedicated to your ping,
but that the user actually uses the line :)
And then of course there comes the bad modem code that makes the connections
slow. But I'd say 100 ms is absolutely normal for analog calls.
PS: ACHTUNG!! Einheitsnummer 0840 840 850 !!
Mit freundlichen Grüssen
Patrick Kormann
DataComm (Schweiz) AG
> -----Ursprüngliche Nachricht-----
> Von: Greg GDS [mailto:greg@gdsys.net]
> Gesendet am: Freitag, 24. Dezember 1999 06:16
> An: pkormann@intern.datacomm.ch
> Betreff: (PM) Strange Situation
>
> Can anyone tell me what might be causing this situation.
>
> We are running the following equip etc. Windows NT, PM3
> Latest comos.27b,
> our PM have Stac Cards in them.
>
> This is the problem, some of our users report ping time to
> our servers in
> the 100-200 Ms range. Sure enough when we ping a user form
> the server some
> are in the 90Ms range but most are 150Ms or more.
>
> Now we ping all the other serves at less than 1Ms, and we can
> ping the PMs
> at less than 3Ms, we can ping the router in less than 3 Ms,
> we can even ping
> a site like altavista at around 140Ms from the network, but
> when we ping a
> user dialed into us it is 150 or more.
>
> Any ideas?
>
> Thanks
> Greg
>
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