QoS Question

Hey Guys was wondering if you can assist.

I have recently been studying Cisco QoS, specifically traffic management. I understand that there are different techniques that can be implemented, such as CBWFQ and LLQ with the later being the one that is serviced first during time of congestion.

My question is specific to CBWFQ. When you allocate bandwidth with the "bandwidth" command as I understand this receives the an amount of bandwidth at times of congestion. However, what I want to know is how does this relate to the queue depth command. If the queue by default is only 64 bytes (I think its this) then should this also be changed when you use the bandwidth command, as surely this won't be enough for most applications?

Any assistance would be much appreciated.