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Add changes file for bug40642.

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Mike Perry 2022-08-04 21:23:40 +00:00 committed by David Goulet
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commit 9fb52305ee
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o Major bugfixes (congestion control):
- Implement RFC3742 Limited Slow Start. Congestion control was
overshooting the congestion window during slow start, particularly for
onion service activity. With this fix, we now update the congestion
window more often during slow start, as well as dampen the exponential
growth when the congestion window grows above a capping parameter.
This should reduce the memory increases guard relays were seeing, as
well as allow us to set lower queue limits to defend against
ongoing DoS attacks. Fixes bug 40642; bugfix on 0.4.7.5-alpha.