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Toke Høiland-Jørgensen recommends using INTERVAL for ECN.

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Otherwise he suspsects that circuits will exit slow start too early.
This commit is contained in:
Mike Perry 2020-07-21 12:22:17 -05:00
parent 4b7d9b1b44
commit 52eebf04ce
1 changed files with 18 additions and 6 deletions
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24
proposals/324-rtt-congestion-control.txt
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@ -192,12 +192,18 @@ outbuf.
The duration of total circuitmux queue time for each cell will be
compared a consensus parameter 'min_queue_target', which is set to 5% of
min network RTT. (This mirrors the CoDel parameter of the same name).
min network RTT. (This mirrors the CoDel TARGET parameter).
As soon as a cell of a circuit spends more than this time in queues, a
per-circuit flag 'ecn_exit_slow_start' will be set to 1. As soon as a
cell is available in the opposite direction on that circuit, the relay
will flip the cell_t.command of from CELL_COMMAND_RELAY to
Additionally, an inspection INTERVAL parameter 'queue_interval' governs
how long queue lengths must exceed 'min_queue_target' before a circuit
is declared congested. This mirrors the CoDel INTERVAL parameter, and it
should default to approximately 50-100% of average network RTT.
As soon as the cells of a circuit spend more than 'min_queue_target'
time in queues for at least 'queue_interval' amount of time, per-circuit
flag 'ecn_exit_slow_start' will be set to 1. As soon as a cell is
available in the opposite direction on that circuit, the relay will flip
the cell_t.command of from CELL_COMMAND_RELAY to
CELL_COMMAND_RELAY_CONGESTION. (We must wait for a cell in the opposite
direction because that is the sender that caused the congestion).
@ -849,6 +855,13 @@ important to tune first):
- Range: [1, 10000]
- Default: 10
queue_interval:
- Description: How long in milliseconds must cells exceed
'min_queue_target' queue delay before we actually send a
congestion signal?
- Range: [1, 10000]
- Default: 200
xoff_client
xoff_mobile
xoff_exit
@ -1122,4 +1135,3 @@ per circuit, at most.
25. Tor Performance Metrics for Live Network Tuning
https://trac.torproject.org/projects/tor/wiki/org/roadmaps/CoreTor/PerformanceMetrics