mbuf: fix performance with 128-byte cache line

[dpdk.git] / lib / librte_eal / linuxapp / eal / include / exec-env / rte_kni_common.h

diff --git a/lib/librte_eal/linuxapp/eal/include/exec-env/rte_kni_common.h b/lib/librte_eal/linuxapp/eal/include/exec-env/rte_kni_common.h
index 07908ac..7e5e598 100644 (file)
--- a/lib/librte_eal/linuxapp/eal/include/exec-env/rte_kni_common.h
+++ b/lib/librte_eal/linuxapp/eal/include/exec-env/rte_kni_common.h
@@ -68,6 +68,8 @@
  */
 #define RTE_KNI_NAMESIZE 32
 
+#define RTE_CACHE_LINE_MIN_SIZE 64
+
 /*
  * Request id.
  */
@@ -108,16 +110,20 @@ struct rte_kni_fifo {
  * Padding is necessary to assure the offsets of these fields
  */
 struct rte_kni_mbuf {
-       void *pool;
-       void *buf_addr;
-       char pad0[16];
-       void *next;
+       void *buf_addr __attribute__((__aligned__(RTE_CACHE_LINE_SIZE)));
+       char pad0[10];
        uint16_t data_off;      /**< Start address of data in segment buffer. */
-       uint16_t data_len;      /**< Amount of data in segment buffer. */
-       uint32_t pkt_len;       /**< Total pkt len: sum of all segment data_len. */
+       char pad1[4];
+       uint64_t ol_flags;      /**< Offload features. */
        char pad2[4];
-       uint16_t ol_flags;      /**< Offload features. */
-} __attribute__((__aligned__(64)));
+       uint32_t pkt_len;       /**< Total pkt len: sum of all segment data_len. */
+       uint16_t data_len;      /**< Amount of data in segment buffer. */
+
+       /* fields on second cache line */
+       char pad3[8] __attribute__((__aligned__(RTE_CACHE_LINE_MIN_SIZE)));
+       void *pool;
+       void *next;
+};
 
 /*
  * Struct used to create a KNI device. Passed to the kernel in IOCTL call