[dpdk-dev] [PATCH v5 4/4] app/testpmd: use per-core variable in flowgen
Zhihong Wang
wangzhihong.wzh at bytedance.com
Fri Aug 13 10:05:48 CEST 2021
Use per-core variable for flow indexing to solve cache contention in
multi-core scenarios.
Signed-off-by: Zhihong Wang <wangzhihong.wzh at bytedance.com>
Acked-by: Xiaoyun Li <xiaoyun.li at intel.com>
---
v5: replace modulo operation to improve performance
v4: use loop local variable to improve performance
app/test-pmd/flowgen.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/app/test-pmd/flowgen.c b/app/test-pmd/flowgen.c
index 229794ee9c..9348618d0f 100644
--- a/app/test-pmd/flowgen.c
+++ b/app/test-pmd/flowgen.c
@@ -53,6 +53,8 @@ static struct rte_ether_addr cfg_ether_dst =
#define IP_DEFTTL 64 /* from RFC 1340. */
+RTE_DEFINE_PER_LCORE(int, _next_flow);
+
/*
* Multi-flow generation mode.
*
@@ -80,7 +82,7 @@ pkt_burst_flow_gen(struct fwd_stream *fs)
uint32_t retry;
uint64_t tx_offloads;
uint64_t start_tsc = 0;
- static int next_flow = 0;
+ int next_flow = RTE_PER_LCORE(_next_flow);
get_start_cycles(&start_tsc);
@@ -163,7 +165,8 @@ pkt_burst_flow_gen(struct fwd_stream *fs)
}
pkts_burst[nb_pkt] = pkt;
- next_flow = (next_flow + 1) % cfg_n_flows;
+ if (++next_flow >= (int)cfg_n_flows)
+ next_flow = 0;
}
nb_tx = rte_eth_tx_burst(fs->tx_port, fs->tx_queue, pkts_burst, nb_pkt);
@@ -193,6 +196,8 @@ pkt_burst_flow_gen(struct fwd_stream *fs)
} while (++nb_tx < nb_pkt);
}
+ RTE_PER_LCORE(_next_flow) = next_flow;
+
get_end_cycles(fs, start_tsc);
}
--
2.11.0
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