Matthias Radestock
025315363d
pcap timeouts are a mystery. Setting the timeout to -1 used to reduce latency, but that was before we started setting immediate mode. And it turns out that with that timeout, pcap chews through a lot of CPU polling its file descriptor, checking timers, etc. However, the behaviour of setting *no* timeout is defined as, err, undefined. So instead we set a very long timeout indeed. And loop if it expires. Fixes #80
51 lines
1.6 KiB
Go
51 lines
1.6 KiB
Go
package weave
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import (
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"time"
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"math"
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)
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const (
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Protocol = "weave"
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ProtocolVersion = 8
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EthernetOverhead = 14
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UDPOverhead = 28 // 20 bytes for IPv4, 8 bytes for UDP
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Port = 6783
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StatusPort = Port + 1
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DefaultPMTU = 65535
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MaxUDPPacketSize = 65536
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ChannelSize = 16
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UDPNonceSendAt = 8192
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FragTestSize = 60001
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PMTUDiscoverySize = 60000
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FastHeartbeat = 500 * time.Millisecond
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SlowHeartbeat = 10 * time.Second
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FetchAllInterval = 30 * time.Second
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FragTestInterval = 5 * time.Minute
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PMTUVerifyAttempts = 8
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PMTUVerifyTimeout = 10 * time.Millisecond // gets doubled with every attempt
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MaxDuration = time.Duration(math.MaxInt64)
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)
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const (
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ProtocolConnectionEstablished = iota
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ProtocolFragmentationReceived = iota
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ProtocolStartFragmentationTest = iota
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ProtocolNonce = iota
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ProtocolFetchAll = iota
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ProtocolUpdate = iota
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ProtocolPMTUVerified = iota
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)
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var (
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FragTest = make([]byte, FragTestSize)
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PMTUDiscovery = make([]byte, PMTUDiscoverySize)
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ProtocolConnectionEstablishedByte = []byte{ProtocolConnectionEstablished}
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ProtocolFragmentationReceivedByte = []byte{ProtocolFragmentationReceived}
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ProtocolStartFragmentationTestByte = []byte{ProtocolStartFragmentationTest}
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ProtocolNonceByte = []byte{ProtocolNonce}
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ProtocolFetchAllByte = []byte{ProtocolFetchAll}
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ProtocolUpdateByte = []byte{ProtocolUpdate}
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ProtocolPMTUVerifiedByte = []byte{ProtocolPMTUVerified}
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)
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