pontification bloat (was 10GE TOR port buffers (was Re: 10G switch recommendaton))

Leo Bicknell bicknell at ufp.org
Fri Jan 27 19:22:49 CST 2012


In a message written on Sat, Jan 28, 2012 at 10:06:20AM +0900, Randy Bush wrote:
> for those who say bufferbloat is a problem, do you have wred enabled on
> backbone or customer links?

For *most backbone networks* it is a no-op on the backbone.  To be
more precise, if the backbone is at least 10x, and preferably more
like 50x faster than the largest single TCP flow from any customer
it will be nearly impossible to measure the performance difference
between a short FIFO queue and a WRED queue.

To the customer, absolutely, whenever possible, which generally
means when the hardware supports.  Ideally with the queue length
tuned to match the link speed of the customer port.  The slower speed
the customer port the more critical the tuning.

-- 
       Leo Bicknell - bicknell at ufp.org - CCIE 3440
        PGP keys at http://www.ufp.org/~bicknell/
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