IntenseWebs/LibreQoS
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Add Cake RTT calculation for low rate connections.

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This commit is contained in:
Herbert Wolverson 2023-05-11 16:55:46 +00:00
parent 10290397cd
commit 12369e5b1a
1 changed files with 28 additions and 4 deletions
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32
src/LibreQoS.py
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@ -740,6 +740,26 @@ def refreshShapers():
# Parse network structure. For each tier, generate commands to create corresponding HTB and leaf classes. Prepare commands for execution later
# Define lists for hash filters
def traverseNetwork(data):
# Cake needs help handling rates lower than 5 Mbps
def sqmFixupRate(rate:int, sqm:str) -> str:
# If we aren't using cake, just return the sqm string
if not sqm.startswith("cake") or "rtt" in sqm:
return sqm
# If we are using cake, we need to fixup the rate
# Based on: 1 MTU is 1500 bytes, or 12,000 bits.
# At 1 Mbps, (1,000 bits per ms) transmitting an MTU takes 12ms. Add 3ms for overhead, and we get 15ms.
# So 15ms divided by 5 (for 1%) multiplied by 100 yields 300ms.
# The same formula gives 180ms at 2Mbps
# 140ms at 3Mbps
# 120ms at 4Mbps
match rate:
case 1: return sqm + " rtt 300"
case 2: return sqm + " rtt 180"
case 3: return sqm + " rtt 140"
case 4: return sqm + " rtt 120"
case _: return sqm
for node in data:
command = 'class add dev ' + interfaceA + ' parent ' + data[node]['parentClassID'] + ' classid ' + data[node]['classMinor'] + ' htb rate '+ str(data[node]['downloadBandwidthMbpsMin']) + 'mbit ceil '+ str(data[node]['downloadBandwidthMbps']) + 'mbit prio 3'
linuxTCcommands.append(command)
@ -760,14 +780,18 @@ def refreshShapers():
command = 'class add dev ' + interfaceA + ' parent ' + data[node]['classid'] + ' classid ' + circuit['classMinor'] + ' htb rate '+ str(circuit['minDownload']) + 'mbit ceil '+ str(circuit['maxDownload']) + 'mbit prio 3' + tcComment
linuxTCcommands.append(command)
# Only add CAKE / fq_codel qdisc if monitorOnlyMode is Off
if monitorOnlyMode == False:
command = 'qdisc add dev ' + interfaceA + ' parent ' + circuit['classMajor'] + ':' + circuit['classMinor'] + ' ' + sqm
if monitorOnlyMode == False:
# SQM Fixup for lower rates
useSqm = sqmFixupRate(circuit['maxDownload'], sqm)
command = 'qdisc add dev ' + interfaceA + ' parent ' + circuit['classMajor'] + ':' + circuit['classMinor'] + ' ' + useSqm
linuxTCcommands.append(command)
command = 'class add dev ' + interfaceB + ' parent ' + data[node]['up_classid'] + ' classid ' + circuit['classMinor'] + ' htb rate '+ str(circuit['minUpload']) + 'mbit ceil '+ str(circuit['maxUpload']) + 'mbit prio 3'
linuxTCcommands.append(command)
# Only add CAKE / fq_codel qdisc if monitorOnlyMode is Off
if monitorOnlyMode == False:
command = 'qdisc add dev ' + interfaceB + ' parent ' + circuit['up_classMajor'] + ':' + circuit['classMinor'] + ' ' + sqm
if monitorOnlyMode == False:
# SQM Fixup for lower rates
useSqm = sqmFixupRate(circuit['maxUpload'], sqm)
command = 'qdisc add dev ' + interfaceB + ' parent ' + circuit['up_classMajor'] + ':' + circuit['classMinor'] + ' ' + useSqm
linuxTCcommands.append(command)
pass
for device in circuit['devices']: