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Diffstat (limited to 'Documentation/lguest/lguest.c')
-rw-r--r--Documentation/lguest/lguest.c12
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