vcl: fix libc epoll pwait starved

[vpp.git] / src / vcl / ldp.c

diff --git a/src/vcl/ldp.c b/src/vcl/ldp.c
index a10d4d0..64a4e7c 100644 (file)
--- a/src/vcl/ldp.c
+++ b/src/vcl/ldp.c
@@ -2516,7 +2516,8 @@ ldp_epoll_pwait_eventfd (int epfd, struct epoll_event *events,
       ldpw->mq_epfd_added = 1;
     }
 
-  rv = vls_epoll_wait (ep_vlsh, events, maxevents, 0);
+  /* Request to only drain unhandled to prevent libc_epoll_wait starved */
+  rv = vls_epoll_wait (ep_vlsh, events, maxevents, -2);
   if (rv > 0)
     goto done;
   else if (PREDICT_FALSE (rv < 0))