3560 ingress queues: increasing buffers vs thresholds

From: Hobbs (deadheadblues@gmail.com)
Date: Fri Sep 26 2008 - 18:23:25 ART


Hi,

I have been labbing 3560 qos a lot lately. I found that increasing threshold
setting one interval at a time, allows more traffic than when increasing the
buffer percentages one interval at a time.

In a real world scenario, can anyone comment on when you would use one
setting over the other?

The commands I am using are:

mls qos srr-queue input threshold 1 1 2
mls qos srr-queue input buffers 4 96

These are the lowest values I could set and still get traffic to pass, up to
183 byte pings

If I were to increase buffers to 5 95, I can send up to 246 byte pings
If I were to increase threshold to 2 3 (while keeping buffers at 4 96) I can
send up to 406

The goal is to get an understanding on how these settings affect traffic
flow and what factors you would consider when increasing one over the other.

thanks,

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