I can confirm that similar setup (no imq) on Gentoo quadcore AMD64 2.6.29 HFSC root class overflows where HTB is ok. This situation persist for about year and few last kernels and I havent found a solution except some notices about HFSC in current linux incarnation being buggy.
Mind giving a pointer to such notices ?
Our solution was return back to HTB :-) If anyone knows why HFSC overflows, please post. Karel P.S.: Half year back we tested simple HFSC setup on bench with 3 classes (5, 10 and 15Mbits with root class 20Mbits) and when we saturated all classes, total flow was 20Mbit for few seconds (5-30) and then it overflowed to about 25Mbit, and sometimes returned back to 20Mbit after few minutes. VERY strange.
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