> On 28 Jul, 2015, at 17:31, Simon Barber <[email protected]> wrote:
> 
> The issue is that Codel tries to keep the delay low, and will start dropping 
> when sojourn time grows above 5ms for 100ms. For longer RTT links more delay 
> is necessary to avoid underutilizing the link.

I’m pretty sure we’ve had this discussion before, several times.

Codel works pretty well, with an interval of 100ms, when the actual RTT is 
between about 10ms and 1000ms.  That accounts for 99.9% of the practical paths 
you’ll see on the Internet.

If you really are concerned about long-RTT paths, then you can increase the 
interval parameter to suit.  This will hurt Codel’s performance slightly on 
very short-RTT paths.

 - Jonathan Morton

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