diff --git a/0021-refactor-event-if-ring-is-full-the-node-is-added-to-.patch b/0021-refactor-event-if-ring-is-full-the-node-is-added-to-.patch
new file mode 100644
index 0000000000000000000000000000000000000000..b5b5e290c9d249049bf95274853a0610c3853c9b
--- /dev/null
+++ b/0021-refactor-event-if-ring-is-full-the-node-is-added-to-.patch
@@ -0,0 +1,33 @@
+From b7faf0800631668d4d23cb497f1ceeb5948e4a41 Mon Sep 17 00:00:00 2001
+From: jiangheng <jiangheng12@huawei.com>
+Date: Tue, 15 Mar 2022 19:22:22 +0800
+Subject: [PATCH] refactor event, if ring is full, the node is added to list
+
+---
+ src/include/lwipsock.h | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+diff --git a/src/include/lwipsock.h b/src/include/lwipsock.h
+index 355bf47..36bcaed 100644
+--- a/src/include/lwipsock.h
++++ b/src/include/lwipsock.h
+@@ -104,12 +104,16 @@ struct lwip_sock {
+   struct pbuf *send_lastdata; /* unread data in one pbuf */
+   void *send_ring;
+   int32_t recv_flags;
++  int32_t send_flags;
+   bool wait_close;
+   int32_t attach_fd;
+   struct lwip_sock *shadowed_sock;
+   struct list_node attach_list;
+   struct list_node listen_list;
+   struct list_node recv_list;
++  struct list_node event_list;
++  struct list_node wakeup_list;
++  struct list_node send_list;
+   int32_t nextfd; /* listenfd list */
+ #endif
+ };
+-- 
+1.8.3.1
+
diff --git a/lwip.spec b/lwip.spec
index a3b51cf0cd21d4bc2333d02ed003b4f5896e989a..352e0b4843c8ce8cec9ab90a0d7714e391133f85 100644
--- a/lwip.spec
+++ b/lwip.spec
@@ -4,7 +4,7 @@
 Summary: lwip is a small independent implementation of the TCP/IP protocol suite
 Name:    lwip
 Version: 2.1.3
-Release: 7
+Release: 8
 License: BSD
 URL:     http://savannah.nongnu.org/projects/lwip/
 Source0: http://download.savannah.nongnu.org/releases/lwip/%{name}-%{version}.tar.gz
@@ -29,6 +29,7 @@ Patch9016:  0017-support-REUSEPOR-option.patch
 Patch9017:  0018-exec-gazelle_init_sock-before-read-event.patch
 Patch9018:  0019-gazelle-reduce-copy-in-send.patch
 Patch9019:  0020-remove-chose_dlsym_handle-function-set-handle-to-RTL.patch
+Patch9020:  0021-refactor-event-if-ring-is-full-the-node-is-added-to-.patch
 
 BuildRequires: gcc-c++ dos2unix dpdk-devel
 
@@ -57,6 +58,9 @@ cd %{_builddir}/%{name}-%{version}/src
 %{_libdir}/liblwip.a
 
 %changelog
+* Tue Mar 15 2022 jiangheng<jiangheng12@huawei.com> - 2.1.3-8
+- refactor event,if ring is full, node is added to list
+
 * Mon Mar 07 2022 jiangheng<jiangheng12@huawei.com> - 2.1.3-7
 - remove chose_dlsym_handle function as it is redundant