Very Computer

Hello All,

I'm running a 28.8k slip link between my linux PC and a SUNworkstation network.
Both the linux slip server and my PC are using 16550 com ports.  However,
whenever I check ifconfig or netstat I always got Tx/Rx Overrun and Dropped.

Then my question is what is the difference between overrun, dropped and error?
What are the factors could affect these in the slip link? Hw/Sw?
How these dropped/overrun affect the link at application level under certain
condition?

Thanks in advance for comments!
marco

|> Hello All,
|>
|> I'm running a 28.8k slip link between my linux PC and a SUNworkstation network.
|> Both the linux slip server and my PC are using 16550 com ports.  However,
|> whenever I check ifconfig or netstat I always got Tx/Rx Overrun and Dropped.
|>
|> Then my question is what is the difference between overrun, dropped and error?
|> What are the factors could affect these in the slip link? Hw/Sw?
|> How these dropped/overrun affect the link at application level under certain
|> condition?
|>
|> Thanks in advance for comments!
|> marco

Not sure if this is the answer or not, but did you set up your
serial port to go at a speed higher than 38400?  To do this you
use SETSERIAL with speed=38400 and add the flag "spd_vhi".  The
spd_vhi is needed to get you above 38400 as the number of bits
available in the port definition max's out at 38400.

If you are only running at 38400, then with modem-based
compression at 28,800 you might still overrun the uart, even with
a 16550 if the system is "busy."

John.

Quote:>I'm running a 28.8k slip link between my linux PC and a SUNworkstation network.
>Both the linux slip server and my PC are using 16550 com ports.  However,
>whenever I check ifconfig or netstat I always got Tx/Rx Overrun and Dropped.

For cslip, the kernel puts the number of compressed packets into
the "overrun" position.  Later versions of ifconfig are smart
enough to know this and rename that field for slip lines.

---
 Bob Hauck                                 Wasatch Communications Group