[tor-commits] [tor] 02/04: relay: Reduce the minimum circuit cell in queue limit

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commit f501564b40252089f551baa45fceeedd16f6bedf
Author: David Goulet <dgoulet at torproject.org>
AuthorDate: Tue Oct 18 12:19:40 2022 -0400

    relay: Reduce the minimum circuit cell in queue limit
    
    With congestion control, the flow control window is much lower than the
    initial 1000.
    
    Signed-off-by: David Goulet <dgoulet at torproject.org>
---
 src/core/or/relay.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/core/or/relay.c b/src/core/or/relay.c
index 5046c9cc55..01a377b6f5 100644
--- a/src/core/or/relay.c
+++ b/src/core/or/relay.c
@@ -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)
 

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