Instantaneous Threshold ECN marking for DCTCP

* Instantaneous Threshold ECN marking for DCTCP
@ 2015-12-17 16:13 Bryce Cronkite-Ratcliff
  2015-12-18 12:49 ` Florian Westphal
  0 siblings, 1 reply; 2+ messages in thread
From: Bryce Cronkite-Ratcliff @ 2015-12-17 16:13 UTC (permalink / raw)
  To: netdev

Hi there,

I am attempting to run some experiments with DCTCP using mininet (so
this is all user-level emulation -- my switch is a linux namespace
using OVS). My question is on how to apply DCTCP's AQM. DCTCP's AQM
just marks all packets with CE if they are received when the queue is
over a threshold value of K and otherwise does not mark CE. The DCTCP
papers I have seen suggest that RED can be used to achieve this: set
probability to 1, burst to 1, and min and max to the same value.

However, tc-red, in accordance with this paper, does not allow burst
to be significantly below the minimum threshold value, so I am unable
to set the parameters I would like -- in particular to set burst to 1
-- without monkey-patching tc.

Is there a way to achieve this simple threshold-ECN marking AQM with
tc, or another approach?

Thank you!

^ permalink raw reply	[flat|nested] 2+ messages in thread