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Patch for concurrent iterator & others (onto v1.11.6) #386

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roysc wants to merge 1565 commits from v1.11.6-statediff-v5 into master
pull from: v1.11.6-statediff-v5
merge into: cerc-io:master
Conversation 0 Commits 1565 Files Changed 1471 +9 -13
1 changed files with 9 additions and 13 deletions
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p2p/msgrate/msgrate.go
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@ -38,14 +38,6 @@ const measurementImpact = 0.1
// to fetch more than some local stable value. // to fetch more than some local stable value.
const capacityOverestimation = 1.01 const capacityOverestimation = 1.01
// qosTuningPeers is the number of best peers to tune round trip times based on.
// An Ethereum node doesn't need hundreds of connections to operate correctly,
// so instead of lowering our download speed to the median of potentially many
// bad nodes, we can target a smaller set of vey good nodes. At worse this will
// result in less nodes to sync from, but that's still better than some hogging
// the pipeline.
const qosTuningPeers = 5
// rttMinEstimate is the minimal round trip time to target requests for. Since // rttMinEstimate is the minimal round trip time to target requests for. Since
// every request entails a 2 way latency + bandwidth + serving database lookups, // every request entails a 2 way latency + bandwidth + serving database lookups,
// it should be generous enough to permit meaningful work to be done on top of // it should be generous enough to permit meaningful work to be done on top of
@ -303,11 +295,15 @@ func (t *Trackers) medianRoundTrip() time.Duration {
} }
sort.Float64s(rtts) sort.Float64s(rtts)
median := rttMaxEstimate var median time.Duration
if qosTuningPeers <= len(rtts) { switch len(rtts) {
median = time.Duration(rtts[qosTuningPeers/2]) // Median of our best few peers case 0:
} else if len(rtts) > 0 { median = rttMaxEstimate
median = time.Duration(rtts[len(rtts)/2]) // Median of all out connected peers case 1:
median = time.Duration(rtts[0])
default:
idx := int(math.Sqrt(float64(len(rtts))))
median = time.Duration(rtts[idx])
} }
// Restrict the RTT into some QoS defaults, irrelevant of true RTT // Restrict the RTT into some QoS defaults, irrelevant of true RTT
if median < rttMinEstimate { if median < rttMinEstimate {