Effect of Changing polling time in hid interrupt transfer

If I recall correctly, the Physical Min and Max are just "window dressing" so to speak. From the HID spec:

While Logical Minimum and Logical Maximum (extents) bound the values returned by a device, Physical Minimum and Physical Maximum give meaning to those bounds by allowing the report value to be offset and scaled. For example, a thermometer might have logical extents of 0 and 999 but physical extents of 32 and 212 degrees.The resolution can be determined with the following algorithm:

So for this example, the HID thermometer would be returning a value between 0-999 in the report. That's the bytes that actually flow from device to PC through an IN endpoint. These values are determined by the Logical Min/Max.

The Physical Min/Max describes how the Logical units map onto a Physical "spectrum". In this case, from water's freezing (32 degrees F) to the boiling (212 F). In this case, when the device sends a 0, it means 32 F, and when it sends 999, it means 212 F. Software can then read the HID descriptor to determine the mapping.

In the grand scheme of things, physical min/max aren't that meaningful unless you intentionally use them. For consistency, I generally set my physical to match my logical.

Try the word MICKEY http://www.webopedia.com/TERM/M/mickey.html

Note, some OS (I believe Windows and Mac does this too) automatically change different "dot-per-inch" depending on the speed of human-user movement. if user move mouse fast, it increase "dot-per-inch". When user move mouse slowly, like doing fine painting on photoshop, it decrease so that user can control/move one or a few pixels.