@@ -189,6 +189,7 @@ static void tap_send(void *opaque)
{
TAPState *s = opaque;
int size;
+ int packets = 0;
while (qemu_can_send_packet(&s->nc)) {
uint8_t *buf = s->buf;
@@ -210,6 +211,17 @@ static void tap_send(void *opaque)
} else if (size < 0) {
break;
}
+
+ /*
+ * When the host keeps receiving more packets while tap_send() is
+ * running we can hog the QEMU global mutex. Limit the number of
+ * packets that are processed per tap_send() callback to prevent
+ * stalling the guest.
+ */
+ packets++;
+ if (packets >= 50) {
+ break;
+ }
}
}