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Increase wifi retries by default. (#1129) 

Experimental wifi research reports that increased retries (rather than decreased as I originally
thought) improves tcp throughput on multi-hop wifi networks.
This commit is contained in:
Tim Wilkinson 2024-03-27 17:01:14 -07:00 committed by GitHub
parent 8e751dcb62
commit f75e4d9675
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GPG Key ID: B5690EEEBB952194
1 changed files with 5 additions and 22 deletions
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27
files/usr/local/bin/mgr/lqm.lua
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@ -50,10 +50,8 @@ local dtd_distance = 50 -- distance (meters) after which nodes connected with Dt
local connect_timeout = 5 -- timeout (seconds) when fetching information from other nodes local connect_timeout = 5 -- timeout (seconds) when fetching information from other nodes
local speed_time = 10 -- local speed_time = 10 --
local speed_limit = 1000 -- close connection if it's too slow (< 1kB/s for 10 seconds) local speed_limit = 1000 -- close connection if it's too slow (< 1kB/s for 10 seconds)
local default_short_retries = 6 -- Default retries for a node with a single connection local default_short_retries = 20 -- More link-level retries helps overall tcp performance (factory default is 7)
local default_long_retries = 4 -- local default_long_retries = 20 -- (factory default is 4)
local minimum_short_retries = 2 -- Minimum retries for nodes with multiple connections
local minimum_long_retries = 2 --
local NFT = "/usr/sbin/nft" local NFT = "/usr/sbin/nft"
local IW = "/usr/sbin/iw" local IW = "/usr/sbin/iw"
@ -242,6 +240,9 @@ function lqm()
iw_set("distance auto") iw_set("distance auto")
-- Or any hidden nodes -- Or any hidden nodes
iw_set("rts off") iw_set("rts off")
-- Set the default retries
--
iw_set("retry short " .. default_short_retries .. " long " .. default_long_retries)
-- If the channel bandwidth is less than 20, we need to adjust what we report as the values from 'iw' will not -- If the channel bandwidth is less than 20, we need to adjust what we report as the values from 'iw' will not
-- be correct -- be correct
@ -966,24 +967,6 @@ function lqm()
end end
hidden_nodes = hidden hidden_nodes = hidden
-- Adjust retry attempts. If we're just managing a single connection, we can retry failed transmissions.
-- If we're managing many, we can't afford the delays associated with retries, so reduce them to the minimum.
-- Don't retry when distance is max because the delay makes thing unusable and blocks other closer traffic.
--[[local short_retries
local long_retries
if distance == config.max_distance or rfcount > 1 then
short_retries = minimum_short_retries
long_retries = minimum_long_retries
else
short_retries = default_short_retries
long_retries = default_long_retries
end
if short_retries ~= last_short_retries or long_retries ~= last_long_retries then
iw_set("retry short " .. short_retries .. " long " .. long_retries)
last_short_retries = short_retries
last_long_retries = long_retries
end]]--
-- Save this for the UI -- Save this for the UI
f = io.open("/tmp/lqm.info", "w") f = io.open("/tmp/lqm.info", "w")
if f then if f then