-
David Bauer authoredIncreasing the receive window size improves throughout on higher-latency links such as WAN connections. The current default of 24KB caps out at around 500 KB/s. Increasing the receive buffer to 256KB increases the throughput to at least 11 MB/s. Signed-off-by:
David Bauer <mail@david-bauer.net>David Bauer authoredIncreasing the receive window size improves throughout on higher-latency links such as WAN connections. The current default of 24KB caps out at around 500 KB/s. Increasing the receive buffer to 256KB increases the throughput to at least 11 MB/s. Signed-off-by:David Bauer <mail@david-bauer.net>
0008-dropbear-increase-default-receive-window-size.patch 1.25 KiB
From: David Bauer <mail@david-bauer.net>
Date: Thu, 28 Dec 2023 23:16:02 +0100
Subject: dropbear: increase default receive window size
Increasing the receive window size improves throughout on higher-latency
links such as WAN connections. The current default of 24KB caps out at
around 500 KB/s.
Increasing the receive buffer to 256KB increases the throughput to at
least 11 MB/s.
Signed-off-by: David Bauer <mail@david-bauer.net>
(cherry picked from commit f95eecfb21ff08662e022accd30e8254028ff63b)
diff --git a/package/network/services/dropbear/files/dropbear.init b/package/network/services/dropbear/files/dropbear.init
index b82e967cbcedc4564dba6cfccc1383f7b7fa499f..a40b5f7baeea0f3a1e258f1a74aba0eb1ca3adcb 100755
--- a/package/network/services/dropbear/files/dropbear.init
+++ b/package/network/services/dropbear/files/dropbear.init
@@ -155,6 +155,12 @@ dropbear_instance()
PIDCOUNT="$(( ${PIDCOUNT} + 1))"
local pid_file="/var/run/${NAME}.${PIDCOUNT}.pid"
+ # Increase default receive window size to increase
+ # throughput on high latency links
+ if [ "${RecvWindowSize}" -eq "0" ]; then
+ RecvWindowSize="262144"
+ fi
+
procd_open_instance
procd_set_param command "$PROG" -F -P "$pid_file"
[ "${PasswordAuth}" -eq 0 ] && procd_append_param command -s