Use the sar -y command to monitor terminal device activities.
$ sar -y 00:00:00 rawch/s canch/s outch/s rcvin/s xmtin/s mdmin/s 01:00:00 0 0 0 0 0 0 |
If you have a lot of terminal I/O, you can use this report to determine if any bad lines exist. The activities recorded are defined in the following list.
Input characters (raw queue) per second.
Input characters that are processed by canon (canonical queue) per second.
Output characters (output queue) per second.
Receiver hardware interrupts per second.
Transmitter hardware interrupts per second.
Modem interrupts per second.
The number of modem interrupts per second (mdmin/s) should be close to zero. The receive and transmit interrupts per second (xmtin/s and rcvin/s) should be less than or equal to the number of incoming or outgoing characters, respectively. If not, check for bad lines.
The following example shows output from the sar -y command.
$ sar -y SunOS balmyday 5.10 s10_51 sun4u 03/18/2004 00:00:04 rawch/s canch/s outch/s rcvin/s xmtin/s mdmin/s 01:00:00 0 0 0 0 0 0 02:00:01 0 0 0 0 0 0 03:00:00 0 0 0 0 0 0 04:00:00 0 0 0 0 0 0 05:00:00 0 0 0 0 0 0 06:00:00 0 0 0 0 0 0 07:00:00 0 0 0 0 0 0 08:00:00 0 0 0 0 0 0 08:20:00 0 0 0 0 0 0 08:40:01 0 0 0 0 0 0 09:00:00 0 0 0 0 0 0 09:20:00 0 0 0 0 0 0 09:40:00 0 0 1 0 0 0 10:00:00 0 0 37 0 0 0 10:20:00 0 0 0 0 0 0 10:40:00 0 0 3 0 0 0 11:00:00 0 0 3 0 0 0 Average 0 0 1 0 0 0 |