microlb: change send queue warning from full to empty

Author: alfreb

lib/microLB/micro_lb/balancer.cpp

@@ -411,26 +411,27 @@ namespace microLB
     [&nodes = n, idx] () {
         nodes.close_session(idx);
     });
-    
+
     // get the actual TCP connections
     auto conn_in  = dynamic_cast<net::tcp::Stream*>(incoming->bottom_transport())->tcp();
     assert(conn_in != nullptr);
     auto conn_out = dynamic_cast<net::tcp::Stream*>(outgoing->bottom_transport())->tcp();
     assert(conn_out != nullptr);
-    
+
     static const uint32_t sendq_max = 0x400000;
     // set recv window handlers
     conn_in->set_recv_wnd_getter(
       [conn_out] () -> uint32_t {
         auto sendq_size = conn_out->sendq_size();
-        if (sendq_size == 0)
+
+        if (sendq_size > sendq_max)
             printf("WARNING: Incoming reports sendq size: %u\n", sendq_size);
         return sendq_max - sendq_size;
       });
     conn_out->set_recv_wnd_getter(
       [conn_in] () -> uint32_t {
         auto sendq_size = conn_in->sendq_size();
-        if (sendq_size == 0)
+        if (sendq_size > sendq_max)
             printf("WARNING: Outgoing reports sendq size: %u\n", sendq_size);
         return sendq_max - sendq_size;
       });