crank the part size; prioritize data channel

types/part_set.go

@@ -15,7 +15,7 @@ import (
 )
 
 const (
-	partSize = 4096 // 4KB
+	partSize = 65536 // 64KB ...  4096 // 4KB
 )
 
 var (
@@ -203,6 +203,7 @@ func (ps *PartSet) AddPart(part *Part) (bool, error) {
 	}
 
 	// Check hash proof
+	// TODO: minor gains for not checking part sets we made
 	if !part.Proof.Verify(part.Index, ps.total, part.Hash(), ps.Hash()) {
 		return false, ErrPartSetInvalidProof
 	}