[dpdk-dev] [PATCH v2] example exception_path: cache align per CPU stats

Dustin Lundquist dustin at null-ptr.net
Tue Feb 13 17:58:56 CET 2018


Align stats structure to cache line to prevent bouncing per CPU stats
structure between cache lines.

Fixes: af75078fece3 ("first public release")

Signed-off-by: Dustin Lundquist <dustin at null-ptr.net>
---
v2:
* Include fixes tag

Verified alignment of lcore_stats array elements using gdb.

 examples/exception_path/main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/examples/exception_path/main.c b/examples/exception_path/main.c
index 280a50451..3e5b1e718 100644
--- a/examples/exception_path/main.c
+++ b/examples/exception_path/main.c
@@ -108,7 +108,7 @@ struct stats {
 	uint64_t rx;
 	uint64_t tx;
 	uint64_t dropped;
-};
+} __rte_cache_aligned;

 /* Array of lcore-specific stats */
 static struct stats lcore_stats[RTE_MAX_LCORE];
--
2.11.0



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