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mpExperience: disable TSO on all interfaces

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It seems TCP can sometimes send packets larger than the MTU because of
TSO (see
https://mailman.stanford.edu/pipermail/mininet-discuss/2013-October/003132.html)
This commit is contained in:
Quentin De Coninck 2017-05-09 10:36:01 +02:00
parent 9e10f49254
commit d0aa85a08f
1 changed files with 31 additions and 0 deletions
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31
src/mpExperience.py
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@ -38,6 +38,7 @@ class MpExperience:
self.mpConfig.configureNetwork() self.mpConfig.configureNetwork()
self.changeMetric() self.changeMetric()
self.putPriorityOnPaths() self.putPriorityOnPaths()
self.disableTSO()
self.runTcpDump() self.runTcpDump()
self.runNetemAt() self.runNetemAt()
pass pass
@ -73,6 +74,36 @@ class MpExperience:
self.mpTopo.commandTo(self.mpConfig.client, self.mpConfig.interfaceBUPCommand(self.mpConfig.getClientInterface(1))) self.mpTopo.commandTo(self.mpConfig.client, self.mpConfig.interfaceBUPCommand(self.mpConfig.getClientInterface(1)))
self.mpTopo.commandTo(self.mpConfig.router, self.mpConfig.interfaceBUPCommand(self.mpConfig.getRouterInterfaceSwitch(1))) self.mpTopo.commandTo(self.mpConfig.router, self.mpConfig.interfaceBUPCommand(self.mpConfig.getRouterInterfaceSwitch(1)))
def disableTSO(self):
links = self.mpTopo.getLinkCharacteristics()
i = 0
for l in links:
lname = self.mpConfig.getMidLeftName(i)
rname = self.mpConfig.getMidRightName(i)
lbox = self.mpTopo.getHost(lname)
lif = self.mpConfig.getMidL2RInterface(i)
rif = self.mpConfig.getMidR2LInterface(i)
rbox = self.mpTopo.getHost(rname)
print(str(lname) + " " + str(lif))
print(str(rname) + " " + str(rif))
print("boxes " + str(lbox) + " " + str(rbox))
cmd = "ethtool -K " + lif + " tso off"
print(cmd)
self.mpTopo.commandTo(lbox, cmd)
cmd = "ethtool -K " + rif + " tso off"
print(cmd)
self.mpTopo.commandTo(rbox, cmd)
i = i + 1
# And for the server
cmd = "ethtool -K " + self.mpConfig.getServerInterface() + " tso off"
print(cmd)
self.mpTopo.commandTo(self.mpConfig.server, cmd)
cmd = "ethtool -K " + self.mpConfig.getRouterInterfaceSwitch(self.mpConfig.getClientInterfaceCount()) + " tso off"
print(cmd)
self.mpTopo.commandTo(self.mpConfig.router, cmd)
def runUserspacePM(self): def runUserspacePM(self):
if self.xpParam.getParam(MpParamXp.KERNELPMC) != "netlink": if self.xpParam.getParam(MpParamXp.KERNELPMC) != "netlink":
print("Client : Error, I can't change the userspace pm if the kernel pm is not netlink !") print("Client : Error, I can't change the userspace pm if the kernel pm is not netlink !")