103 lines
3.9 KiB
Python
103 lines
3.9 KiB
Python
import math
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class MpLinkCharacteristics:
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tcNetemParent = "1:1"
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tcHtbClassid = "10"
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tcNetemHandle = "1:10"
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def bandwidthDelayProductDividedByMTU(self):
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rtt = 2 * float(self.delay)
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""" Since bandwidth is in Mbps and rtt in ms """
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bandwidthDelayProduct = (float(self.bandwidth) * 125000.0) * (rtt / 1000.0)
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return int(math.ceil(bandwidthDelayProduct * 1.0 / 1500.0))
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def bufferSize(self):
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return (1500.0 * self.bandwidthDelayProductDividedByMTU()) + (float(self.bandwidth) * 1000.0 * float(self.queuingDelay) / 8)
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def extractQueuingDelay(self, queueSize, bandwidth, delay, mtu=1500):
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# rtt = 2 * float(delay)
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# bdp_queue_size = int((float(rtt) * float(bandwidth) * 1024 * 1024) / (int(mtu) * 8 * 1000))
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# if int(queueSize) <= bdp_queue_size:
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# Returning 0 seems to bypass everything, then only limited by CPU.
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# This is not what we want...
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# return 1
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# queuingQueueSize = int(queueSize) - bdp_queue_size
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queuingDelay = (int(queueSize) * int(mtu) * 8.0 * 1000.0) / (float(bandwidth) * 1024 * 1024)
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return max(int(queuingDelay), 1)
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def __init__(self, id, delay, queueSize, bandwidth, loss, back_up=False):
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self.id = id
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self.delay = delay
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self.queueSize = queueSize
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self.bandwidth = bandwidth
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self.loss = loss
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self.queuingDelay = str(self.extractQueuingDelay(queueSize, bandwidth, delay))
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self.netemAt = []
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self.back_up = back_up
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def addNetemAt(self, n):
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if len(self.netemAt) == 0:
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n.delta = n.at
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self.netemAt.append(n)
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else:
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if n.at > self.netemAt[-1].at:
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n.delta = n.at - self.netemAt[-1].at
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self.netemAt.append(n)
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else:
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print("Do not take into account " + n.__str__() + \
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"because ooo !")
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pass
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def buildBwCmd(self, ifname):
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cmd = ""
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for n in self.netemAt:
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cmd = cmd + "sleep {}".format(n.delta)
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cmd = cmd + " && tc qdisc del dev {} root ".format(ifname)
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cmd = cmd + " ; tc qdisc add dev {} root handle 5:0 tbf rate {}mbit burst 15000 limit {} &&".format(ifname, self.bandwidth, int(self.bufferSize()))
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cmd = cmd + " true &"
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return cmd
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def buildNetemCmd(self, ifname):
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cmd = ""
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for n in self.netemAt:
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cmd = cmd + "sleep " + str(n.delta)
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cmd = cmd + " && tc qdisc del dev " + ifname + " root "
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cmd = cmd + " ; tc qdisc add dev {} root handle 10: netem {} delay {}ms limit 50000 &&".format(ifname, n.cmd, self.delay)
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cmd = cmd + " true &"
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return cmd
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def buildPolicingCmd(self, ifname):
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cmd = ""
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for n in self.netemAt:
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cmd = cmd + "sleep {}".format(n.delta)
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cmd = cmd + " && tc qdisc del dev {} ingress".format(ifname)
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cmd = cmd + " ; tc qdisc add dev {} handle ffff: ingress".format(ifname)
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cmd = cmd + " && tc filter add dev {} parent ffff: u32 match u32 0 0 police rate {}mbit burst {} drop && ".format(ifname, self.bandwidth, int(self.bufferSize() * 1.2))
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cmd = cmd + " true &"
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return cmd
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def asDict(self):
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d = {}
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d['bw'] = float(self.bandwidth)
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d['delay'] = self.delay + "ms"
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d['loss'] = float(self.loss)
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d['max_queue_size'] = int(self.queueSize)
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return d
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def __str__(self):
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s = "Link id : " + str(self.id) + "\n"
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s = s + "\tDelay : " + str(self.delay) + "\n"
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s = s + "\tQueue Size : " + str(self.queueSize) + "\n"
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s = s + "\tBandwidth : " + str(self.bandwidth) + "\n"
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s = s + "\tLoss : " + str(self.loss) + "\n"
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s = s + "\tBack up : " + str(self.back_up) + "\n"
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for l in self.netemAt:
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s = s + "\t" + l.__str__() + "\n"
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return s
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