1 files changed, 11 insertions, 1 deletions

diff --git a/Documentation/lguest/lguest.c b/Documentation/lguest/lguest.c
index 018472cee151..b2bbbb7f8c57 100644
--- a/Documentation/lguest/lguest.c
+++ b/Documentation/lguest/lguest.c
@@ -84,6 +84,7 @@ static void *guest_base;
 static unsigned long guest_limit, guest_max;
 /* The pipe for signal hander to write to. */
 static int timeoutpipe[2];
+static unsigned int timeout_usec = 500;
 
 /* a per-cpu variable indicating whose vcpu is currently running */
 static unsigned int __thread cpu_id;
@@ -905,7 +906,7 @@ static void block_vq(struct virtqueue *vq)
         itm.it_interval.tv_sec = 0;
         itm.it_interval.tv_usec = 0;
         itm.it_value.tv_sec = 0;
-        itm.it_value.tv_usec = 500;
+        itm.it_value.tv_usec = timeout_usec;
 
         setitimer(ITIMER_REAL, &itm, NULL);
 }
@@ -922,6 +923,7 @@ static void handle_net_output(int fd, struct virtqueue *vq, bool timeout)
         unsigned int head, out, in, num = 0;
         int len;
         struct iovec iov[vq->vring.num];
+        static int last_timeout_num;
 
         /* Keep getting output buffers from the Guest until we run out. */
         while ((head = get_vq_desc(vq, iov, &out, &in)) != vq->vring.num) {
@@ -939,6 +941,14 @@ static void handle_net_output(int fd, struct virtqueue *vq, bool timeout)
         /* Block further kicks and set up a timer if we saw anything. */
         if (!timeout && num)
                 block_vq(vq);
+
+        if (timeout) {
+                if (num < last_timeout_num)
+                        timeout_usec += 10;
+                else if (timeout_usec > 1)
+                        timeout_usec--;
+                last_timeout_num = num;
+        }
 }
 
 /* This is where we handle a packet coming in from the tun device to our