tweaked buffer sizes

database/postgis/buffer.go

@@ -17,7 +17,7 @@ type InsertBuffer struct {
 
 func NewInsertBuffer(pg *PostGIS) *InsertBuffer {
 	ib := InsertBuffer{
-		In:     make(chan InsertElement, 64),
+		In:     make(chan InsertElement),
 		Tables: make(map[string]*TableTx),
 		wg:     &sync.WaitGroup{},
 	}

database/postgis/postgis.go

@@ -481,7 +481,7 @@ func (pg *PostGIS) NewTableTx(spec *TableSpec) *TableTx {
 		Table: spec.Name,
 		Spec:  spec,
 		wg:    &sync.WaitGroup{},
-		rows:  make(chan []interface{}, 512),
+		rows:  make(chan []interface{}, 64),
 	}
 	tt.wg.Add(1)
 	go tt.loop()