[LARTC] Why did I need strange ceiling settings?

[Philipp Leusmann <philipp.leusmann@rwth-aachen.de>]

Hi all,

I recently installed traffic shaping on my ADSL line with a nominal upload
rate of 1MBit. My Modem says it has an upload bitrate of 843 kbits.
So I thought, to use a ceiling of 800kbit for the root qdisc is a good idea.
But with that setting I only achieved upload rates of around 300kbits
whereas I reached around 650 kbits without traffic shaping.
Yesterday I played a little with the ceiling value and found that increasing
it to 175kBps did the job.
Could anybody please explain this strange behaviour? 

My shaping script looks as follows:


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