From 3d63cb611a0b7a3cde0bb9e74b0ec83501966c51 Mon Sep 17 00:00:00 2001
From: wuchangsheng <wuchangsheng2@huawei.com>
Date: Sun, 18 Dec 2022 18:50:33 +0800
Subject: [PATCH 2/2] add prefetch

---
 src/core/pbuf.c    | 7 +++++++
 src/core/tcp_out.c | 6 ++++++
 2 files changed, 13 insertions(+)

diff --git a/src/core/pbuf.c b/src/core/pbuf.c
index 404c8a7..ad75aa6 100644
--- a/src/core/pbuf.c
+++ b/src/core/pbuf.c
@@ -83,6 +83,9 @@
 #if LWIP_CHECKSUM_ON_COPY
 #include "lwip/inet_chksum.h"
 #endif
+#if USE_LIBOS
+#include <rte_prefetch.h>
+#endif
 
 #include <string.h>
 
@@ -750,6 +753,10 @@ pbuf_free(struct pbuf *p)
   /* de-allocate all consecutive pbufs from the head of the chain that
    * obtain a zero reference count after decrementing*/
   while (p != NULL) {
+#if USE_LIBOS
+    if (p->next)
+      rte_prefetch0(p->next);
+#endif
     LWIP_PBUF_REF_T ref;
     SYS_ARCH_DECL_PROTECT(old_level);
     /* Since decrementing ref cannot be guaranteed to be a single machine operation
diff --git a/src/core/tcp_out.c b/src/core/tcp_out.c
index 55053d8..3c4dc4b 100644
--- a/src/core/tcp_out.c
+++ b/src/core/tcp_out.c
@@ -82,6 +82,7 @@
 
 #if USE_LIBOS
 #include "lwipsock.h"
+#include <rte_prefetch.h>
 #if CHECKSUM_GEN_TCP_HW
 #include "dpdk_cksum.h"
 #endif
@@ -1762,6 +1763,11 @@ tcp_output_segment(struct tcp_seg *seg, struct tcp_pcb *pcb, struct netif *netif
   }
 #endif
 
+#if USE_LIBOS
+  /* pbuf into mbuf. ref dpdk_common.h */
+  rte_prefetch0((uint8_t *)(seg->p) - sizeof(struct rte_mbuf) - sizeof(uint64_t) * 2);
+#endif
+
   /* Set retransmission timer running if it is not currently enabled
      This must be set before checking the route. */
   if (pcb->rtime < 0) {
-- 
2.8.4.windows.1