Quick question and simple I think but I want to make sure.

1) What is the difference between queue-sample-timeout  and start-tracing
2) In the file they produce I know that the columns are as follows
time
from
to
queue size in Bytes(right now)
queue size in Packets(right now)
number arrived packets
number departed packets
number dropped packets
number arrived bytes
number departed bytes
number dropped bytes

My question is this: The size is at the moment the tracing is done. What
about the arrived,departed and dropped packets(or bytes). Is it the number
of the last interval?
For instance,lets say I trace every 0.00001s and two consecutive lines have
the following:
0.00001    10    15000    20    10    1    30000    15000    1500
0.00002    13    19500    30    20    5    45000    30000    7500

Does that mean that in an interval of 0.00001s between the two samples 30
packets arrived, 20 departed and 5 were dropped OR 30 packets arrived so
far, 20 departed so far and 5 were dropped so far (meaning that between
0.00001 and 0.00002 10 packets arrived, 10 packets departed and 4 packets
were dropped)?



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