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-rw-r--r--VNFs/DPPD-PROX/handle_gen.c20
1 files changed, 18 insertions, 2 deletions
diff --git a/VNFs/DPPD-PROX/handle_gen.c b/VNFs/DPPD-PROX/handle_gen.c
index fcdbcd6..4bf2e6e 100644
--- a/VNFs/DPPD-PROX/handle_gen.c
+++ b/VNFs/DPPD-PROX/handle_gen.c
@@ -13,7 +13,6 @@
// See the License for the specific language governing permissions and
// limitations under the License.
*/
-
#include <rte_mbuf.h>
#include <pcap.h>
#include <string.h>
@@ -669,6 +668,20 @@ static int handle_gen_bulk(struct task_base *tbase, struct rte_mbuf **mbufs, uin
task_gen_checksum_packets(task, new_pkts, pkt_hdr, send_bulk);
ret = task->base.tx_pkt(&task->base, new_pkts, send_bulk, out);
task_gen_store_accuracy(task, send_bulk, tsc_before_tx);
+
+ // If we failed to send some packets, we need to do some clean-up:
+
+ if (unlikely(ret)) {
+ // We need re-use the packets indexes not being sent
+ // Hence non-sent packets will not be considered as lost by the receiver when it looks at
+ // packet ids. This should also increase the percentage of packets used for latency measurements
+ task->pkt_queue_index -= ret;
+
+ // In case of failures, the estimate about when we can send next packet (earliest_tsc_next_pkt) is wrong
+ // This would result in under-estimated latency (up to 0 or negative)
+ uint64_t bulk_duration = task_gen_calc_bulk_duration(task, ret);
+ task->earliest_tsc_next_pkt -= bulk_duration;
+ }
return ret;
}
@@ -1275,11 +1288,14 @@ static void init_task_gen(struct task_base *tbase, struct task_args *targ)
plog_info("\tPort %u: max link speed is %ld Mbps\n",
(uint8_t)(task->port - prox_port_cfg), 8 * bytes_per_hz / 1000000);
}
+ // There are cases where hz estimate might be slighly over-estimated
+ // This results in too much extrapolation
+ // Only account for 99% of extrapolation to handle cases with up to 1% error clocks
for (unsigned int i = 0; i < task->max_frame_size * MAX_PKT_BURST ; i++) {
if (bytes_per_hz == UINT64_MAX)
task->bytes_to_tsc[i] = 0;
else
- task->bytes_to_tsc[i] = (task->hz * i) / bytes_per_hz;
+ task->bytes_to_tsc[i] = (task->hz * i * 0.99) / bytes_per_hz;
}
if (!strcmp(targ->pcap_file, "")) {