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eth/downloader: cap the TTL to a reasonable 1 minute

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This commit is contained in:
Péter Szilágyi 2016-06-03 11:25:35 +03:00
parent 2925dc3f07
commit ad8378a8d1
1 changed files with 7 additions and 2 deletions
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9
eth/downloader/downloader.go
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@ -57,7 +57,8 @@ var (
rttMinEstimate = 2 * time.Second // Minimum round-trip time to target for download requests
rttMaxEstimate = 20 * time.Second // Maximum rount-trip time to target for download requests
rttMinConfidence = 0.1 // Worse confidence factor in our estimated RTT value
rttTTLScaling = 3 // Constant scaling factor for RTT -> TTL conversion
ttlScaling = 3 // Constant scaling factor for RTT -> TTL conversion
ttlLimit = time.Minute // Maximum TTL allowance to prevent reaching crazy timeouts
qosTuningPeers = 5 // Number of peers to tune based on (best peers)
qosConfidenceCap = 10 // Number of peers above which not to modify RTT confidence
@ -1949,5 +1950,9 @@ func (d *Downloader) requestTTL() time.Duration {
rtt = time.Duration(atomic.LoadUint64(&d.rttEstimate))
conf = float64(atomic.LoadUint64(&d.rttConfidence)) / 1000000.0
)
return time.Duration(rttTTLScaling) * time.Duration(float64(rtt)/conf)
ttl := time.Duration(ttlScaling) * time.Duration(float64(rtt)/conf)
if ttl > ttlLimit {
ttl = ttlLimit
}
return ttl
}