Fix handling of group rate limits under 64 bytes of burst

The "min_share" logic, which was designed to prevent piles of
extremely small writes when running up against a group rate limit,
could lead to confusing behavior if you ever set a min_share less
than your burst rate.  If that happened, then as soon as your group
rate limit was exhausted, you'd stop reading/writing, and never
start again, since the amount readable/writeable would never
actually hit min_share.

We now cap min_share at the rate per tick.

Found by George Kadianakis

1 files changed, 2 insertions, 0 deletions

diff --git a/bufferevent-internal.h b/bufferevent-internal.h
index 71711a36..dc471720 100644
--- a/bufferevent-internal.h
+++ b/bufferevent-internal.h
@@ -98,6 +98,8 @@ struct bufferevent_rate_limit_group {
 	/** The smallest number of bytes that any member of the group should
 	 * be limited to read or write at a time. */
 	ev_ssize_t min_share;
+	ev_ssize_t configured_min_share;
+
 	/** Timeout event that goes off once a tick, when the bucket is ready
 	 * to refill. */
 	struct event master_refill_event;