So, I am getting deep into my CCIE study and I just read about the TX-ring-limit interface command. I have used QoS a bit to oversubscribe software buffers to prevent frame loss on switches and whatnot, can you use the "TX-ring-limit" in a similar manner to decrease the likelihood of frame loss during bursty traffic on a LAN?
Additionally I understand the following:
1) TX-ring-limit should be set to either a value of 1 or 2 for a low speed interface such as a T1 serial
2) Higher values can be configured on higher speed interfaces
3) Setting a high value can introduce jitter on a link because the software queue of a IOS device will send the packets to the hardware queue where they are simply FIFO
Has anyone experimented with setting this to a higher value on ethernet LAN interfaces to allow the hardware queue to "hold on to frames" during a bursty traffic period, rather than drop them?