configurable per-dispatch-cycle sleep

Workaround for lack of driver interrupt support. Also quite handy for
home gateway, laptop/vagrant, other use-cases not requiring maximum
vectors/second for proper operation.

Change-Id: Ifc4b98112450664beef67b89ab8a6940a3bf24b5
Signed-off-by: Dave Barach <dave@barachs.net>

3 files changed, 0 insertions, 27 deletions

diff --git a/src/plugins/dpdk/device/dpdk.h b/src/plugins/dpdk/device/dpdk.h
index d88e294e835..8fa803567ee 100644
--- a/src/plugins/dpdk/device/dpdk.h
+++ b/src/plugins/dpdk/device/dpdk.h
@@ -433,9 +433,6 @@ typedef struct
   f64 link_state_poll_interval;
   f64 stat_poll_interval;
 
-  /* Sleep for this many usec after each device poll */
-  u32 poll_sleep_usec;
-
   /* convenience */
   vlib_main_t *vlib_main;
   vnet_main_t *vnet_main;
diff --git a/src/plugins/dpdk/device/init.c b/src/plugins/dpdk/device/init.c
index 61057776ebf..0ab339b8455 100644
--- a/src/plugins/dpdk/device/init.c
+++ b/src/plugins/dpdk/device/init.c
@@ -1005,7 +1005,6 @@ static clib_error_t *
 dpdk_config (vlib_main_t * vm, unformat_input_t * input)
 {
   clib_error_t *error = 0;
-  dpdk_main_t *dm = &dpdk_main;
   dpdk_config_main_t *conf = &dpdk_config_main;
   vlib_thread_main_t *tm = vlib_get_thread_main ();
   dpdk_device_config_t *devconf;
@@ -1097,8 +1096,6 @@ dpdk_config (vlib_main_t * vm, unformat_input_t * input)
 	  tmp = format (0, "--no-pci%c", 0);
 	  vec_add1 (conf->eal_init_args, tmp);
 	}
-      else if (unformat (input, "poll-sleep %d", &dm->poll_sleep_usec))
-	;
 
 #define _(a)                                    \
       else if (unformat(input, #a))             \
diff --git a/src/plugins/dpdk/device/node.c b/src/plugins/dpdk/device/node.c
index bdd0bd0a5c4..8fc8f410ee3 100644
--- a/src/plugins/dpdk/device/node.c
+++ b/src/plugins/dpdk/device/node.c
@@ -156,24 +156,6 @@ dpdk_prefetch_buffer_data_x4 (struct rte_mbuf *mb[])
   CLIB_PREFETCH (b->data, CLIB_CACHE_LINE_BYTES, LOAD);
 }
 
-static inline void
-poll_rate_limit (dpdk_main_t * dm)
-{
-  /* Limit the poll rate by sleeping for N msec between polls */
-  if (PREDICT_FALSE (dm->poll_sleep_usec != 0))
-    {
-      struct timespec ts, tsrem;
-
-      ts.tv_sec = 0;
-      ts.tv_nsec = 1000 * dm->poll_sleep_usec;
-
-      while (nanosleep (&ts, &tsrem) < 0)
-	{
-	  ts = tsrem;
-	}
-    }
-}
-
 /** \brief Main DPDK input node
     @node dpdk-input
 
@@ -659,9 +641,6 @@ VLIB_NODE_FN (dpdk_input_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
 					 dq->queue_id);
     }
   /* *INDENT-ON* */
-
-  poll_rate_limit (dm);
-
   return n_rx_packets;
 }