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relay: Reduce the minimum circuit cell in queue limit

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With congestion control, the flow control window is much lower than the
initial 1000.

Signed-off-by: David Goulet <dgoulet@torproject.org>
This commit is contained in:
David Goulet 2022-10-18 12:19:40 -04:00
parent a2c034d8f5
commit f501564b40
1 changed files with 6 additions and 3 deletions
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9
src/core/or/relay.c
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@ -3134,6 +3134,9 @@ channel_flush_from_first_active_circuit, (channel_t *chan, int max))
}
/* Minimum value is the maximum circuit window size.
*
* This value is set to a lower bound we believe is reasonable with congestion
* control and basic network tunning parameters.
*
* SENDME cells makes it that we can control how many cells can be inflight on
* a circuit from end to end. This logic makes it that on any circuit cell
@ -3157,12 +3160,12 @@ channel_flush_from_first_active_circuit, (channel_t *chan, int max))
* DoS memory pressure so the default size is a middle ground between not
* having any limit and having a very restricted one. This is why we can also
* control it through a consensus parameter. */
#define RELAY_CIRC_CELL_QUEUE_SIZE_MIN CIRCWINDOW_START_MAX
#define RELAY_CIRC_CELL_QUEUE_SIZE_MIN 50
/* We can't have a consensus parameter above this value. */
#define RELAY_CIRC_CELL_QUEUE_SIZE_MAX INT32_MAX
/* Default value is set to a large value so we can handle padding cells
* properly which aren't accounted for in the SENDME window. Default is 50000
* allowed cells in the queue resulting in ~25MB. */
* properly which aren't accounted for in the SENDME window. Default is 2500
* allowed cells in the queue resulting in ~1MB. */
#define RELAY_CIRC_CELL_QUEUE_SIZE_DEFAULT \
(50 * RELAY_CIRC_CELL_QUEUE_SIZE_MIN)