From 1dc3e3bcbfe335843ec938bfdddb34d10f4dd278 Mon Sep 17 00:00:00 2001 From: Rusty Russell Date: Tue, 26 Aug 2008 00:19:27 -0500 Subject: lguest: update commentry Signed-off-by: Rusty Russell --- Documentation/lguest/lguest.c | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'Documentation/lguest') 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; -- cgit v1.2.3