Merge pull request ipfs/go-bitswap#93 from ipfs/fix/reduce-provide-wo…

…rkers

reduce provide workers to 6

This commit was moved from ipfs/go-bitswap@85e3f43

bitswap/bitswap.go

@@ -46,14 +46,15 @@ const (
 	maxProvidersPerRequest = 3
 	findProviderDelay      = 1 * time.Second
 	providerRequestTimeout = time.Second * 10
-	provideTimeout         = time.Second * 15
-	sizeBatchRequestChan   = 32
+	// these requests take at _least_ two minutes at the moment.
+	provideTimeout       = time.Minute * 3
+	sizeBatchRequestChan = 32
 )
 
 var (
 	HasBlockBufferSize    = 256
 	provideKeysBufferSize = 2048
-	provideWorkerMax      = 512
+	provideWorkerMax      = 6
 
 	// the 1<<18+15 is to observe old file chunks that are 1<<18 + 14 in size
 	metricsBuckets = []float64{1 << 6, 1 << 10, 1 << 14, 1 << 18, 1<<18 + 15, 1 << 22}