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eth/downloader: add a basic block download congestion control

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This commit is contained in:
Péter Szilágyi
2015-06-03 14:39:21 +03:00
parent 9085b10508
commit c9a546c310
5 changed files with 67 additions and 55 deletions
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10
eth/downloader/queue.go
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@ -203,7 +203,7 @@ func (q *queue) TakeBlocks() []*Block {
// Reserve reserves a set of hashes for the given peer, skipping any previously
// failed download.
func (q *queue) Reserve(p *peer, max int) *fetchRequest {
func (q *queue) Reserve(p *peer) *fetchRequest {
q.lock.Lock()
defer q.lock.Unlock()
@ -215,11 +215,17 @@ func (q *queue) Reserve(p *peer, max int) *fetchRequest {
if _, ok := q.pendPool[p.id]; ok {
return nil
}
// Calculate an upper limit on the hashes we might fetch (i.e. throttling)
space := len(q.blockCache) - len(q.blockPool)
for _, request := range q.pendPool {
space -= len(request.Hashes)
}
// Retrieve a batch of hashes, skipping previously failed ones
send := make(map[common.Hash]int)
skip := make(map[common.Hash]int)
for len(send) < max && !q.hashQueue.Empty() {
capacity := p.Capacity()
for len(send) < space && len(send) < capacity && !q.hashQueue.Empty() {
hash, priority := q.hashQueue.Pop()
if p.ignored.Has(hash) {
skip[hash.(common.Hash)] = int(priority)