[altq:1831] [Q]about CBQ_MAX_CLASSES variable

[soyoung@taonetworks.com]

Hi, I have a question about CBQ_MAX_CLASSES variable.

cbq_state_t structure has a 'cbq_class_tbl' member and it is allocated an 
array of size 'CBQ_MAX_CLASSES' in the 'cbq_ifattach' function.
Currently, CBQ_MAX_CLASSES is defined as 256 in the  'sys/altq/altq_cbq.h',
and I think this variable shows the 'maximum number of effective simultaneous
classes for the accuracy in bandwidth allocation' about altq mechanism..
Am I right?

I need more classes for the CBQ configuration. According to the kernel code, 
if I change the CBQ_MAX_CLASSES to the number greater than 256, 
it doesn't seem to have any problem in compile, 
but I'm not sure all those classes still show the same accuracy 
about their allocated bandwidth. 

I think if altq is run on the higher performance system, it doesn't affect
the accuracy about bandwidth allocation to change CBQ_MAX_CLASSES. 
Is there any recommendation or guide for setting CBQ_MAX_CLASSES variables?

Thanks in advance..