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Complete congestion control text #776

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merged 3 commits into from Sep 19, 2017
Merged

Complete congestion control text #776

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73b3387
Complete congestion control text
ianswett Sep 18, 2017
60545c8
Add text on pacing rate
ianswett Sep 18, 2017
9d5ec51
Fix nits
ianswett Sep 19, 2017
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16 changes: 12 additions & 4 deletions draft-ietf-quic-recovery.md
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Expand Up @@ -616,20 +616,28 @@ congestion window once as long as they're lost before exiting recovery.
## Tail Loss Probe

If recovery sends a tail loss probe, no change is made to the congestion
window or pacing rate. Acknowledgement or loss of tail loss probes are treated like
any other packet.
window or pacing rate. Acknowledgement or loss of tail loss probes are
treated like any other packet.

## Retransmission Timeout

When retransmissions are sent due to a retransmission timeout alarm, no
change is made to the congestion window or pacing rate until the next
acknowledgement arrives. When it arrives, if packets prior to the first
acknowledgement arrives. When an ack arrives, if packets prior to the first
retransmission timeout are acknowledged, then the congestion window
remains the same. If no packets prior to the first retransmission timeout
are acknowledged, the retransmission timeout has been validated and the
congestion window must be reduced to the minimum congestion window and
slow start is begun.

## Pacing Rate

The pacing rate is a function of the mode, the congestion window, and
the smoothed rtt. Specifically, the pacing rate is 2 times the
congestion window divided by the smoothed RTT during slow start
and 1.25 times the congestion window divided by the smoothed RTT during
slow start.

## Pseudocode

### Constants of interest
Expand Down Expand Up @@ -731,7 +739,7 @@ the first post-RTO acknowledgement is processed.
congestion_window = kMinimumWindow
~~~

## Pacing Packets
### Pacing Packets

QUIC sends a packet if there is available congestion window and
sending the packet does not exceed the pacing rate.
Expand Down