utils

Documentation

Index

• func CalcLatencyMean(pkts gofluent10g.CapturePackets) float64
• func CalcLatencyStdDev(pkts gofluent10g.CapturePackets, latencyMean float64) float64
• func GenTraceCBR(datarate float64, pktlenWire, pktlenCapture int, duration time.Duration, ...) *gofluent10g.Trace
• func GenTraceRandom(datarateMean float64, pktlenCaptureMax int, duration time.Duration, ...) *gofluent10g.Trace
• type LatencyCDF
  • func CalcLatencyCDF(pkts gofluent10g.CapturePackets) LatencyCDF
• type LatencyHistogram
  • func CalcLatencyHistogram(pkts gofluent10g.CapturePackets) (LatencyHistogram, int)

Functions

func CalcLatencyMean

func CalcLatencyMean(pkts gofluent10g.CapturePackets) float64

CalcLatencyMean calculates the mean latency based on a slice of captured packets.

func CalcLatencyStdDev

func CalcLatencyStdDev(pkts gofluent10g.CapturePackets, latencyMean float64) float64

CalcLatencyStdDev calculates the latency standard deviation based on a slice of captured packets.

func GenTraceCBR

func GenTraceCBR(datarate float64, pktlenWire, pktlenCapture int, duration time.Duration, nRepeats int) *gofluent10g.Trace

GenTraceCBR generates traffic with constant bit rate and packet lenghts. Only Ethernet and IPv4 headers are generated, payload bits are set to zero. datarate defines the target data rate, pktlenWire the length of the generated packets. pktlenCapture defines the number of data bytes that are written to the hardware, the hardware adds pktlenWire - pktlenCapture zero bytes to restore the original packet length. Since the Ethernet FCS is not included in the trace, but appended by the MAC, the condition pktlenCapture + 4 >= pktlenWire must always hold true. The duration parameter specifies the total duration of the generated trace. The parameter nRepeats determins how often the generated trace shall be replayed. Data is only generated for the first replay, the generator wraps around for all further replays.

func GenTraceRandom

func GenTraceRandom(datarateMean float64, pktlenCaptureMax int, duration time.Duration, nRepeats int) *gofluent10g.Trace

GenTraceRandom generates random traffic with a mean data rate specified by the datarateMean (bits per second) parameter. The size of each packet is uniformly distributed between 64 and 1518 bytes (size of the Ethernet frame, i.e. starting with destination MAC address, ending with FCS). To reach the target mean data rate, a gap is inserted between packets. The length of the packet is determined by an exponential distribution. pktlenCaptureMax defines the maximum number of data bytes that are written to the hardware. Hardware then appends zero bytes to the packet to restore its original length. The duration parameter specifies the total duration of the generated trace. The parameter nRepeats determins how often the generated trace shall be replayed. Data is only generated for the first replay, the generator wraps around for all further replays.

Types

type LatencyCDF

type LatencyCDF []struct {
	Latency, Probability float64
}

LatencyCDF describes the data structure containing CDF data.

func CalcLatencyCDF

func CalcLatencyCDF(pkts gofluent10g.CapturePackets) LatencyCDF

CalcLatencyCDF calculates a latency CDF based on a slice of captured packets.

type LatencyHistogram

type LatencyHistogram []struct {
	Latency     float64
	Occurrences int
}

LatencyHistogram defines a struct that contains information on how often each latency value was recorded.

func CalcLatencyHistogram

func CalcLatencyHistogram(pkts gofluent10g.CapturePackets) (LatencyHistogram, int)

CalcLatencyHistogram calculates the latency histogram based on a slice of captured packets. It returns the latency histogram as well as the total number of latency values.