On Wed, May 1, 2013 at 8:27 PM, ryanL <[email protected]> wrote: > i'm guessing this is a buffer thing, but i can't explain why it only > happens on my 1ge ports and not when i punt the traffic over an 10ge
Yes, it is a buffer thing. A 10GE interface is basically never going to not have time to transmit frames unless it is receiving from 10 or more 1GE interfaces at the same instant, steadily, for long enough to fill the buffer; or there is at least one 10GE interface also talking to it. On the other hand, two 1GE interfaces transmitting toward the same out-going 1GE port can fill its buffer. This is sometimes not obvious, because you look at the long-term traffic and see a few hundred Mb/s, thinking, "why is there packet loss?" You must keep in mind that the available buffer on modern ToR switches is often less than 1ms worth of traffic. The "buffer bloat" discussion of recent years has not done us any favors. Many customers now think that buffers have historically been too big. In fact, they were just often used incorrectly / configured badly. Now we are not evaluating purchases based on having sufficient buffer, so vendors have spent years developing products that ... lack sufficient buffer. -- Jeff S Wheeler <[email protected]> Sr Network Operator / Innovative Network Concepts _______________________________________________ juniper-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/juniper-nsp
