dropbear: add option to set receive window size
The default receive window size in dropbear is hardcoded to 24576 byte to limit memory usage. This value was chosen for 100Mbps networks, and limits the throughput of scp on faster networks. It also severely limits scp throughput on high-latency links. Add an option to set the receive window size so that people can improve performance without having to recompile dropbear. Setting the window size to the highest value supported by dropbear improves throughput from my build machine to an APU2 on the same LAN from 7MB/s to 7.9MB/s, and to an APU2 over a link with ~65ms latency from 320KB/s to 7.5MB/s. Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
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1 changed files with 4 additions and 1 deletions
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@ -42,6 +42,7 @@ validate_section_dropbear()
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'SSHKeepAlive:uinteger:300' \
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'IdleTimeout:uinteger:0' \
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'MaxAuthTries:uinteger:3' \
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'RecvWindowSize:uinteger:0' \
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'mdns:bool:1'
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}
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@ -50,7 +51,7 @@ dropbear_instance()
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local PasswordAuth enable Interface GatewayPorts \
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RootPasswordAuth RootLogin rsakeyfile \
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BannerFile Port SSHKeepAlive IdleTimeout \
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MaxAuthTries mdns ipaddrs
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MaxAuthTries RecvWindowSize mdns ipaddrs
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validate_section_dropbear "${1}" || {
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echo "validation failed"
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@ -80,6 +81,8 @@ dropbear_instance()
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[ "${IdleTimeout}" -ne 0 ] && procd_append_param command -I "${IdleTimeout}"
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[ "${SSHKeepAlive}" -ne 0 ] && procd_append_param command -K "${SSHKeepAlive}"
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[ "${MaxAuthTries}" -ne 0 ] && procd_append_param command -T "${MaxAuthTries}"
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[ "${RecvWindowSize}" -gt 0 -a "${RecvWindowSize}" -le 1048576 ] && \
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procd_append_param command -W "${RecvWindowSize}"
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[ "${mdns}" -ne 0 ] && procd_add_mdns "ssh" "tcp" "$Port" "daemon=dropbear"
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procd_set_param respawn
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procd_close_instance
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