[Cerowrt-devel] Ubiquiti QOS
swmike at swm.pp.se
Sun May 25 20:18:30 EDT 2014
On Sun, 25 May 2014, dpreed at reed.com wrote:
> The optimum buffer state for throughput is 1-2 packets worth - in other
> words, if we have an MTU of 1500, 1500 - 3000 bytes. Only the bottleneck
No, the optimal state for througbut is to have huge buffers and have them
filled. The optimal state for interactivity is to have very small buffers.
FQ_CODEL tries to strike a balance between the two at 10ms of buffer. PIE
does the same around 20ms. In order for PIE to work properly I'd say you
need 50ms of buffering as a minimum, otherwise you're going to get 100%
tail drop and multiple sequential drops occasionally (which might be
desireable to keep interactivity good).
My comment about 50ms is that you seldom need a lot more.
Mikael Abrahamsson email: swmike at swm.pp.se
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