Judge loss by arrival order and a deadline, one tx ring per stream

main.go

@@ -104,6 +104,10 @@ func totalRow(elapsed time.Duration, v view, target float64, phy phyDisplay) []s
 	}
 }
 
+// One dedicated cpu per tx feeder, spaced two apart so no two spinners share
+// a hyperthread pair; xps maps each cpu to its stream's own ring.
+func txCPU(iface, stream int) int { return (iface*numStreams + stream) * 2 }
+
 const (
 	numStreams = 2
 	batchSize  = 64
@@ -242,8 +246,8 @@ func run(aName, bName string) (err error) {
 	diag := newCableDiag(modules, cableInfo{})
 
 	var dirs []*direction
-	for _, p := range [][2]endpoint{{a, b}, {b, a}} {
-		d, err := buildDirection(p[0].name+"->"+p[1].name, p[0], p[1], &diag.masked)
+	for i, p := range [][2]endpoint{{a, b}, {b, a}} {
+		d, err := buildDirection(p[0].name+"->"+p[1].name, i, p[0], p[1], &diag.masked)
 		if err != nil {
 			return err
 		}