diff --git a/fixbug-increase-maximum-number-of-cpus-rdma.patch b/fixbug-increase-maximum-number-of-cpus-rdma.patch
new file mode 100644
index 0000000000000000000000000000000000000000..77dcae7cd92d69bf6143c06fa081239e1e35155b
--- /dev/null
+++ b/fixbug-increase-maximum-number-of-cpus-rdma.patch
@@ -0,0 +1,12 @@
+diff -ur a/infiniband-diags/ibsysstat.c b/infiniband-diags/ibsysstat.c
+--- a/infiniband-diags/ibsysstat.c	2020-04-14 16:28:27.000000000 +0800
++++ b/infiniband-diags/ibsysstat.c	2021-09-24 11:11:41.430169043 +0800
+@@ -41,7 +41,7 @@
+ 
+ #include "ibdiag_common.h"
+ 
+-#define MAX_CPUS 8
++#define MAX_CPUS 256
+ 
+ static struct ibmad_port *srcport;
+ 
diff --git a/rdma-core.spec b/rdma-core.spec
index e3ca8bc5069ff9c4de73a01609647bd9695c1408..ffc203d206606fd54fcf2ae2076d505ce17b1ed8 100644
--- a/rdma-core.spec
+++ b/rdma-core.spec
@@ -1,6 +1,6 @@
 Name:           rdma-core
 Version:        28.1
-Release:        3
+Release:        4
 Summary:        RDMA core userspace libraries and daemons
 License:        GPLv2 or BSD
 Url:            https://github.com/linux-rdma/rdma-core
@@ -48,6 +48,8 @@ Obsoletes:      openib-srptools <= 0.0.6
 
 Conflicts:      infiniband-diags <= 1.6.7
 
+Patch9003:  fixbug-increase-maximum-number-of-cpus-rdma.patch
+
 %{?systemd_requires}
 
 %define CMAKE_FLAGS -GNinja
@@ -254,6 +256,12 @@ rm -f %{buildroot}/%{_sbindir}/srp_daemon.sh
 %{_mandir}/*
 
 %changelog
+* Thu Sep 23 2021 zhongxuan <zhongxuan2@huawei.com> - 28.1-4
+- Type: bugfix
+- ID: NA
+- SUG: NA
+- DESC: increase maximum number of cpus
+
 * Fri Aug 21 2020 yuboyun <yuboyun@huawei.com> - 28.1-3
 - Type: bugfix
 - ID: NA