Would you explain how threshold values can be more than 100% ?

Links on documentation highly appreciated.

ds-118#sh mls qos queue-set 2

Queueset: 2

Queue : 1 2 3 4

----------------------------------------------

buffers : 16 6 17 61

threshold1: 149 118 41 42

threshold2: 149 118 68 72

reserved : 100 100 100 100

maximum : 149 235 272 242

ds-188#sh run | i 118

mls qos queue-set output 2 threshold 2 118 118 100 235