summaryrefslogtreecommitdiffstats
path: root/VNFs/DPPD-PROX
diff options
context:
space:
mode:
authorDeepak S <deepak.s@linux.intel.com>2019-03-13 04:27:26 +0000
committerGerrit Code Review <gerrit@opnfv.org>2019-03-13 04:27:26 +0000
commitaf95b812c39e7fa039b7041b6cb8aba0c5e88c02 (patch)
tree97f105bbfb839dd238f07cf8dc837d0875c2c448 /VNFs/DPPD-PROX
parent08b50dbe2f85cbc5dfcb632099ca26a5c1c5d4ec (diff)
parent3d17d9c7e0daae0b82973283a23f3e85d0decabd (diff)
Merge "Fix PROX generator latency"
Diffstat (limited to 'VNFs/DPPD-PROX')
-rw-r--r--VNFs/DPPD-PROX/handle_gen.c20
-rw-r--r--VNFs/DPPD-PROX/handle_lat.c7
2 files changed, 23 insertions, 4 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, "")) {
diff --git a/VNFs/DPPD-PROX/handle_lat.c b/VNFs/DPPD-PROX/handle_lat.c
index 93652d4..b4e016e 100644
--- a/VNFs/DPPD-PROX/handle_lat.c
+++ b/VNFs/DPPD-PROX/handle_lat.c
@@ -437,7 +437,7 @@ static uint32_t task_lat_early_loss_detect(struct task_lat *task, uint32_t packe
static uint64_t tsc_extrapolate_backward(struct task_lat *task, uint64_t tsc_from, uint64_t bytes, uint64_t tsc_minimum)
{
-#ifdef NO_EXTRAPOLATION
+#ifdef NO_LAT_EXTRAPOLATION
uint64_t tsc = tsc_from;
#else
uint64_t tsc = tsc_from - task->bytes_to_tsc[bytes];
@@ -806,11 +806,14 @@ static void init_task_lat(struct task_base *tbase, struct task_args *targ)
PROX_PANIC(task->bytes_to_tsc == NULL,
"Failed to allocate %u bytes (in huge pages) for bytes_to_tsc\n", max_frame_size);
+ // 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 < 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] = (rte_get_tsc_hz() * i) / bytes_per_hz;
+ task->bytes_to_tsc[i] = (rte_get_tsc_hz() * i * 0.99) / bytes_per_hz;
}
}