Glossary

DQT

Device Queue Time

HW TIME Hardware service time

FPT

Function Pending Time

FW TIME Firmware service time

DDT

Device Disconnect Time

SW TIME Software service time

DCT

Device Connect Time

 

RST

Remaining Service Time

 

software service time (DCS)

See “service times definition (DCS, I/O operations)” on page 455.

software service time (non-DCS)

The software service time (also called software duration) is obtained by adding the waiting time of an input/output request in the device queue of the system to the hardware duration (see “hardware service time (non-DCS)” on page 449).

task queues

Q0 A task is in this queue when it is using the CPU.

Q1 Tasks in this queue are waiting to use the CPU.

Q2 This is the queue for the SM2 write task.

Q3 Tasks waiting for end of paging.

Q4 Tasks waiting for peripheral I/O termination (disk, tape), for task communication events (boursing, ITC), or for VPASS where msec is specified.

Q5 Ready tasks waiting to become active again.

Q6 .Ready tasks waiting to be admitted (PCS).

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Siemens SM2 monitoring system, U3585-J-Z125-8-76 1 Software service time DCS, Software service time non-DCS, Task queues