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

Saku Ytti saku at ytti.fi
Sat Jan 28 13:09:02 UTC 2012

On (2012-01-28 21:53 +0900), Masataka Ohta wrote:
> 1.5MB @ 100Mbps is 120ms, which is prohibitively lengthy
> even as BE.
> The solution is to have less number of classes.

The solution is to per class define max queue size, so user with fewer
queues configured will not use all available buffer in remaining queues.
JNPR MX is happy to buffer >4s on 10GE on QX interfaces. Reading some posts
on this thread seems to imply vendor is not knowing what they are doing,
but in this case there is good reason why there is potentially lot of
buffer space and it's simply operator mistake not to limit it if
application is just single class in single vlan/untagged 10G interface


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