srr-queue bandwidth share 10 10 60 20 vs mls qos queue-set output 1 buffers 25 25 25 25

[Mike Schooley]

should my srr-queue bandwidth allocation match my queue set buffer allocation.

auto qos sets up 25 25 25 25 for buffer allocation with always needs to be changed, but shouldnt this buffer allocation also match bandwidth allocation, if i am allowing 60% of bandwidth for queue 3 shouldnt i match it with 60% of buffers?  

I usually use the config below which usually eliminates most of my output drops.  But if i use this config for my buffers shouldnt i modify my srr-queue bandwidth to 10 20 20 50 instead of 10 10 60 20 ?????

mls qos queue-set output 1 threshold 1 400 400 100 1000
mls qos queue-set output 1 threshold 2 400 400 100 1000
mls qos queue-set output 1 threshold 3 400 400 100 1000
mls qos queue-set output 1 threshold 4 400 400 100 1000
mls qos queue-set output 1 buffers 10 20 20 50

[Joseph W. Doherty]

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Posting

No, they don't need to match.  If fact, sometimes you configure them as an "inverse" because queues with higher bandwidth percentages often are less likely to queue.

However, one size often doesn't fit all.  I.e. just as you set bandwidth ratios to meet your QoS service needs, you may need to configure buffers allocations to also meet your QoS service needs.