Setting the polling interval

Red Hat Enterprise Linux 9.2 LPAR mode z/VM guest KVM guest

Request polling is supported at nanosecond intervals.

Procedure

Use the lszcrypt and chzcrypt commands to read and set the polling time.
Examples:
- To find out the current polling time, issue:
```
# lszcrypt -b
...
poll_timeout=250000 (nanoseconds)
```
- To set the polling time to 1 microsecond, issue:
```
# chzcrypt -t 1000
```
Alternatively, you can set the polling time through the poll_timeout sysfs attribute. This read-write attribute can be found at the AP bus level.
Examples:
- To read the poll_timeout attribute for the ap bus issue:
```
# cat  /sys/bus/ap/poll_timeout
```
- To set the poll_timeout attribute for the ap bus to poll, for example, every microsecond, issue:
```
# echo 1000 > /sys/bus/ap/poll_timeout
```