diff mbox series

[v3] latencystats: fix timestamp marking and latency calculation

Message ID 1537887086-19960-1-git-send-email-reshma.pattan@intel.com (mailing list archive)
State Accepted, archived
Delegated to: Thomas Monjalon
Headers
Series [v3] latencystats: fix timestamp marking and latency calculation |

Checks

Context Check Description
ci/checkpatch success coding style OK
ci/Intel-compilation success Compilation OK

Commit Message

Pattan, Reshma Sept. 25, 2018, 2:51 p.m. UTC 
  Latency calculation logic is not correct for the case where
packets gets dropped before TX. As for the dropped packets,
the timestamp is not cleared, and such packets still gets
counted for latency calculation in next runs, that will result
in inaccurate latency measurement.

So fix this issue as below,

Before setting timestamp in mbuf, check mbuf don't have
any prior valid time stamp flag set and after marking
the timestamp, set mbuf flags to indicate timestamp is
valid.

Before calculating timestamp check mbuf flags are set to
indicate timestamp is valid.

With the above logic it is guaranteed that correct timestamps
have been used.

Fixes: 5cd3cac9ed ("latency: added new library for latency stats")

CC: stable@dpdk.org

Reported-by: Bao-Long Tran <longtb5@viettel.com.vn>
Signed-off-by: Reshma Pattan <reshma.pattan@intel.com>
Tested-by: Bao-Long Tran <longtb5@viettel.com.vn>
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>

---
v3: style related fix
v2: remove check for mbuf->timestamp
---
 lib/librte_latencystats/rte_latencystats.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

Comments

Thomas Monjalon Oct. 25, 2018, 8:31 a.m. UTC | #1 
25/09/2018 16:51, Reshma Pattan:
> Latency calculation logic is not correct for the case where
> packets gets dropped before TX. As for the dropped packets,
> the timestamp is not cleared, and such packets still gets
> counted for latency calculation in next runs, that will result
> in inaccurate latency measurement.
> 
> So fix this issue as below,
> 
> Before setting timestamp in mbuf, check mbuf don't have
> any prior valid time stamp flag set and after marking
> the timestamp, set mbuf flags to indicate timestamp is
> valid.
> 
> Before calculating timestamp check mbuf flags are set to
> indicate timestamp is valid.
> 
> With the above logic it is guaranteed that correct timestamps
> have been used.
> 
> Fixes: 5cd3cac9ed ("latency: added new library for latency stats")
> 
> CC: stable@dpdk.org
> 
> Reported-by: Bao-Long Tran <longtb5@viettel.com.vn>
> Signed-off-by: Reshma Pattan <reshma.pattan@intel.com>
> Tested-by: Bao-Long Tran <longtb5@viettel.com.vn>
> Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
> 
> ---
> v3: style related fix
> v2: remove check for mbuf->timestamp
> ---

Applied, thanks
diff mbox series

Patch

diff --git a/lib/librte_latencystats/rte_latencystats.c b/lib/librte_latencystats/rte_latencystats.c
index 1fdec68e3..5715549e4 100644
--- a/lib/librte_latencystats/rte_latencystats.c
+++ b/lib/librte_latencystats/rte_latencystats.c
@@ -125,8 +125,11 @@  add_time_stamps(uint16_t pid __rte_unused,
 	for (i = 0; i < nb_pkts; i++) {
 		diff_tsc = now - prev_tsc;
 		timer_tsc += diff_tsc;
-		if (timer_tsc >= samp_intvl) {
+
+		if ((pkts[i]->ol_flags & PKT_RX_TIMESTAMP) == 0
+				&& (timer_tsc >= samp_intvl)) {
 			pkts[i]->timestamp = now;
+			pkts[i]->ol_flags |= PKT_RX_TIMESTAMP;
 			timer_tsc = 0;
 		}
 		prev_tsc = now;
@@ -156,7 +159,7 @@  calc_latency(uint16_t pid __rte_unused,
 
 	now = rte_rdtsc();
 	for (i = 0; i < nb_pkts; i++) {
-		if (pkts[i]->timestamp)
+		if (pkts[i]->ol_flags & PKT_RX_TIMESTAMP)
 			latency[cnt++] = now - pkts[i]->timestamp;
 	}