see router.config.template mods and the new unit tests.
this implementation can cause starvation -
e.g. lots of 1KB writes will go through before a 32KB write if the queue is low and the bwlimiter only replenishes say, 16KBps
another impl would enforce a FIFO through thread wait/notify, etc, but would have the related overhead.
i dont know whether starvation situations will be the norm or the exception. i'm running this on a few routers so we'll see.
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