[v2] examples/l3fwd: skip TX queue drain on first iteration
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Commit Message
Initialize prev_tsc to cur_tsc. This avoids running the TX queue drain
in the first iteration of the packet processing loop.
Signed-off-by: Kathleen Capella <kathleen.capella@arm.com>
Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
---
examples/l3fwd/l3fwd_em.c | 9 +++++----
examples/l3fwd/l3fwd_lpm.c | 9 +++++----
2 files changed, 10 insertions(+), 8 deletions(-)
Comments
08/04/2021 23:35, Kathleen Capella:
> Initialize prev_tsc to cur_tsc. This avoids running the TX queue drain
> in the first iteration of the packet processing loop.
>
> Signed-off-by: Kathleen Capella <kathleen.capella@arm.com>
> Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
Applied, thanks
@@ -629,8 +629,6 @@ em_main_loop(__rte_unused void *dummy)
const uint64_t drain_tsc = (rte_get_tsc_hz() + US_PER_S - 1) /
US_PER_S * BURST_TX_DRAIN_US;
- prev_tsc = 0;
-
lcore_id = rte_lcore_id();
qconf = &lcore_conf[lcore_id];
@@ -650,9 +648,10 @@ em_main_loop(__rte_unused void *dummy)
lcore_id, portid, queueid);
}
- while (!force_quit) {
+ cur_tsc = rte_rdtsc();
+ prev_tsc = cur_tsc;
- cur_tsc = rte_rdtsc();
+ while (!force_quit) {
/*
* TX burst queue drain
@@ -692,6 +691,8 @@ em_main_loop(__rte_unused void *dummy)
portid, qconf);
#endif
}
+
+ cur_tsc = rte_rdtsc();
}
return 0;
@@ -185,8 +185,6 @@ lpm_main_loop(__rte_unused void *dummy)
const uint64_t drain_tsc = (rte_get_tsc_hz() + US_PER_S - 1) /
US_PER_S * BURST_TX_DRAIN_US;
- prev_tsc = 0;
-
lcore_id = rte_lcore_id();
qconf = &lcore_conf[lcore_id];
@@ -206,9 +204,10 @@ lpm_main_loop(__rte_unused void *dummy)
lcore_id, portid, queueid);
}
- while (!force_quit) {
+ cur_tsc = rte_rdtsc();
+ prev_tsc = cur_tsc;
- cur_tsc = rte_rdtsc();
+ while (!force_quit) {
/*
* TX burst queue drain
@@ -249,6 +248,8 @@ lpm_main_loop(__rte_unused void *dummy)
portid, qconf);
#endif /* X86 */
}
+
+ cur_tsc = rte_rdtsc();
}
return 0;