diff options
Diffstat (limited to 'Documentation/lguest/lguest.c')
| -rw-r--r-- | Documentation/lguest/lguest.c | 12 |
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 |