[Cake] profiling using perf

[Georgios Amanakis]

Dear List,

I made an effort to profile the performance of cake with perf in
openwrt. perf was run on a WRT1900ACS router while downloading
archlinux.iso via torrent in a LAN client. You can find the annotated
sch_cake.c in the attachment as well as a performance histogram of
sch_cake (percentages are relative to sch_cake). Hopefully people can
take a look at it, and see if there are performance concerns.

Best,
George
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