lguest: update commentry

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 8 insertions, 0 deletions

diff --git a/Documentation/lguest/lguest.c b/Documentation/lguest/lguest.c
index 655414821edc..7228369d1014 100644
--- a/Documentation/lguest/lguest.c
+++ b/Documentation/lguest/lguest.c
@@ -895,6 +895,9 @@ static void handle_console_output(int fd, struct virtqueue *vq, bool timeout)
         }
 }
 
+/* This is called when we no longer want to hear about Guest changes to a
+ * virtqueue.  This is more efficient in high-traffic cases, but it means we
+ * have to set a timer to check if any more changes have occurred. */
 static void block_vq(struct virtqueue *vq)
 {
         struct itimerval itm;
@@ -939,6 +942,11 @@ static void handle_net_output(int fd, struct virtqueue *vq, bool timeout)
         if (!timeout && num)
                 block_vq(vq);
 
+        /* We never quite know how long should we wait before we check the
+         * queue again for more packets.  We start at 500 microseconds, and if
+         * we get fewer packets than last time, we assume we made the timeout
+         * too small and increase it by 10 microseconds.  Otherwise, we drop it
+         * by one microsecond every time.  It seems to work well enough. */
         if (timeout) {
                 if (num < last_timeout_num)
                         timeout_usec += 10;