TTY Touble Shooting Problem

[InduPramod]

Hi,

LABEL: TTY_TTYHOG
IDENTIFIER: 0873CF9F

Date/Time: Tue Aug 28 14:34:44
Sequence Number: 10754
Machine Id: 00C2980B4C00
Node Id: rspe00
Class: S
Type: TEMP
Resource Name: tty0

Description
TTYHOG OVER-RUN

Failure Causes
EXCESSIVE LOAD ON PROCESSOR

Recommended Actions
REDUCE SYSTEM LOAD.
REDUCE SERIAL PORT BAUD RATE

What is the cause of this problem. Can anyone help me

 

[jmss]

I've seen this before on a HACMP Cluster - for the port that's monitoring the heartbeat.

There's some documentation relating the the tty settings I think the parameter is IMAXBEL - which ignores overflows

have a look at stty

 

[aixqueen]

Description of error

The error TTY TTYHOG indicates that the sending device is ignoring flow control. This
error occurs after the hardware FIFO has been accessed and has written to the
software buffer. In other words the tty hog error is logged because the buffer where
incoming characters are placed is overflowing. When the buffer is about 3/4's full,
the device driver notifies the hardware to ( in this case tty ) send the XOFF char
to the sender to stop sending data. If the sender continues to send data AND
the buffer is not emptied, the device driver flushes the buffer and logs the error
message in the error log.


Things to verify

Check cabling - cables without proper shielding can cause problems; cables without
proper pinouts can cause problems.

Check flow control of device (xon/xoff, rts/cts). Keep in mind that hardware
handshaking requires correct cabling, pinouts, and rts on the device stack (e.g., stty
add rts < /dev/tty0).

 

[aixqueen]

sorry for the spacing above...check out this doc also

http://www.rs6000.ibm.com/doc_link/en_US/a_doc_lib/aixbman/commadmn/tty_trouble.htm#CFE2A9C075trau