test_tcp_congestion comment

Author: nobody

test/sys/test_sockopt.rs

@@ -14,7 +14,10 @@ fn test_so_buf() {
     assert!(actual >= bufsize);
 }
 
-// The CI doesn't supported getsockopt and setsockopt on emulated processors
+// The CI doesn't supported getsockopt and setsockopt on emulated processors.
+// It's beleived that a QEMU issue, the tests run ok on a fully emulated system.
+// Current CI just run the binary with QEMU but the Kernel remains the same as the host.
+// So the syscall doesn't work properly unless the kernel is also emulated.
 #[test]
 #[cfg(all(
     any(target_arch = "x86", target_arch = "x86_64"),