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Change-Id: I8712b8b29108162ac7bb0f76b32b0c8f81259833

Author: qiulaidongfeng

src/cmd/dist/test.go

@@ -1313,10 +1313,11 @@ func (t *tester) runPending(nextTest *distTest) {
 		}(w)
 	}
 
-	// for runtime.NumCPU() > 4 , do not change maxbg.
+	// for runtime.NumCPU() < 4 ||  runtime.GOMAXPROCS(0) == 1, do not change maxbg.
 	// Because there is not enough CPU to parallel the testing of multiple packages.
 	if runtime.NumCPU() > 4 && runtime.GOMAXPROCS(0) != 1 {
 		for _, w := range worklist {
+			// See go.dev/issue/65164
 			// because GOMAXPROCS=2 runtime CPU usage is low,
 			// so increase maxbg to avoid slowing down execution with low CPU usage.
 			// This makes testing a single package slower,