Show cumulative error counts in the streaming rows

main.go

@@ -186,12 +186,12 @@ var intervalCols = []colSpec{
 	{title: "TX Gb/s", width: 7, right: true},
 	{title: "RX pps", width: 9, right: true},
 	{title: "RX Gb/s", width: 7, right: true},
-	{title: "LOST", width: 8, right: true},
-	{title: "LATE", width: 6, right: true},
-	{title: "CRC", width: 5, right: true},
-	{title: "BADMAG", width: 6, right: true},
-	{title: "KDROP", width: 7, right: true},
-	{title: "ERRORS", width: 10, right: true},
+	{title: "LOST", width: 11, right: true},
+	{title: "LATE", width: 9, right: true},
+	{title: "CRC", width: 7, right: true},
+	{title: "BADMAG", width: 7, right: true},
+	{title: "KDROP", width: 11, right: true},
+	{title: "ERRORS", width: 11, right: true},
 }
 
 func (d *direction) intervalRow(elapsed time.Duration, secs, target float64) []string {
@@ -204,7 +204,6 @@ func (d *direction) intervalRow(elapsed time.Duration, secs, target float64) []s
 	rxF := now.rxFrames - p.rxFrames
 	rxB := now.rxBytes - p.rxBytes
 
-	before := d.drops
 	d.sampleDrops()
 	total := now.lost + now.crcErr + now.badMagic + now.badLen + d.drops
 
@@ -215,11 +214,11 @@ func (d *direction) intervalRow(elapsed time.Duration, secs, target float64) []s
 		rateCell(gbps(txB, txF, secs), target),
 		commas(uint64(float64(rxF) / secs)),
 		rateCell(gbps(rxB, rxF, secs), target),
-		statusCell(now.lost - p.lost),
-		statusCell(now.late - p.late),
-		statusCell(now.crcErr - p.crcErr),
-		statusCell(now.badMagic - p.badMagic),
-		statusCell(d.drops - before),
+		statusCell(now.lost),
+		statusCell(now.late),
+		statusCell(now.crcErr),
+		statusCell(now.badMagic),
+		statusCell(d.drops),
 		statusCell(total),
 	}
 }
@@ -478,6 +477,7 @@ func run(aName, bName, sizesArg, patArg, fanout, txCPUsArg, rxCPUsArg string,
 				humanBytes(uint64(sockBufSize(dirs[0].txFDs[0], unix.SO_SNDBUF))),
 				humanBytes(uint64(sockBufSize(dirs[0].rxFDs[0], unix.SO_RCVBUF))))},
 		}))
+	fmt.Println(paint("rates are per interval; error counts are cumulative since start", cDim))
 	fmt.Println()
 
 	var doneTx, doneRx atomic.Bool