diff --git a/0001-util-mr_cache-Implement-new-MR-caching-path-w-o-merg.patch b/0001-util-mr_cache-Implement-new-MR-caching-path-w-o-merg.patch
new file mode 100644
index 0000000000000000000000000000000000000000..b8154feb483a0b409533c702c0a58a289fa74f0a
--- /dev/null
+++ b/0001-util-mr_cache-Implement-new-MR-caching-path-w-o-merg.patch
@@ -0,0 +1,94 @@
+From 6e3cbac77fb00f29176f3e29e07d3579ad9e125a Mon Sep 17 00:00:00 2001
+From: Dmitry Gladkov <dmitry.gladkov@intel.com>
+Date: Thu, 29 Mar 2018 16:34:36 +0300
+Subject: [PATCH] util/mr_cache: Implement new MR caching path w/o merging
+ regions
+
+Signed-off-by: Dmitry Gladkov <dmitry.gladkov@intel.com>
+---
+ include/ofi_iov.h             | 14 ++++++++++++++
+ include/ofi_mr.h              |  1 +
+ prov/util/src/util_mr_cache.c | 16 +++++++++++++++-
+ 3 files changed, 30 insertions(+), 1 deletion(-)
+
+diff --git a/include/ofi_iov.h b/include/ofi_iov.h
+index bcc86fc98..dbf4b377d 100644
+--- a/include/ofi_iov.h
++++ b/include/ofi_iov.h
+@@ -117,6 +117,20 @@ ofi_iov_right(const struct iovec *iov1, const struct iovec *iov2)
+ 	return iov1->iov_base > ofi_iov_end(iov2);
+ }
+ 
++static inline bool
++ofi_iov_shifted_left(const struct iovec *iov1, const struct iovec *iov2)
++{
++	return ((iov1->iov_base < iov2->iov_base) &&
++		(ofi_iov_end(iov1) < ofi_iov_end(iov2)));
++}
++
++static inline bool
++ofi_iov_shifted_right(const struct iovec *iov1, const struct iovec *iov2)
++{
++	return ((iov1->iov_base > iov2->iov_base) &&
++		(ofi_iov_end(iov1) > ofi_iov_end(iov2)));
++}
++
+ static inline bool
+ ofi_iov_within(const struct iovec *iov1, const struct iovec *iov2)
+ {
+diff --git a/include/ofi_mr.h b/include/ofi_mr.h
+index a3f23dd6e..05c156871 100644
+--- a/include/ofi_mr.h
++++ b/include/ofi_mr.h
+@@ -186,6 +186,7 @@ struct ofi_mr_cache {
+ 	struct ofi_notification_queue	nq;
+ 	size_t				max_cached_cnt;
+ 	size_t				max_cached_size;
++	int				merge_regions;
+ 	size_t				entry_data_size;
+ 
+ 	RbtHandle			mr_tree;
+diff --git a/prov/util/src/util_mr_cache.c b/prov/util/src/util_mr_cache.c
+index c1b2e9956..6a74ff491 100644
+--- a/prov/util/src/util_mr_cache.c
++++ b/prov/util/src/util_mr_cache.c
+@@ -38,6 +38,17 @@
+ #include <ofi_mr.h>
+ #include <ofi_list.h>
+ 
++static int util_mr_find_within(void *a, void *b)
++{
++	struct iovec *iov1 = a, *iov2 = b;
++
++	if (ofi_iov_shifted_left(iov1, iov2))
++		return -1;
++	else if (ofi_iov_shifted_right(iov1, iov2))
++		return 1;
++	else
++		return 0;
++}
+ 
+ static int util_mr_find_overlap(void *a, void *b)
+ {
+@@ -252,6 +263,7 @@ int ofi_mr_cache_search(struct ofi_mr_cache *cache, const struct fi_mr_attr *att
+ 
+ 	rbtKeyValue(cache->mr_tree, iter, (void **) &iov, (void **) entry);
+ 
++	/* This branch is always false if the merging entries wasn't requested */
+ 	if (!ofi_iov_within(attr->mr_iov, iov))
+ 		return util_mr_cache_merge(cache, attr, iter, entry);
+ 
+@@ -292,7 +304,9 @@ int ofi_mr_cache_init(struct util_domain *domain, struct ofi_mem_monitor *monito
+ {
+ 	assert(cache->add_region && cache->delete_region);
+ 
+-	cache->mr_tree = rbtNew(util_mr_find_overlap);
++	cache->mr_tree = rbtNew(cache->merge_regions ?
++				util_mr_find_overlap :
++				util_mr_find_within);
+ 	if (!cache->mr_tree)
+ 		return -FI_ENOMEM;
+ 
+-- 
+2.42.0.windows.2
+
diff --git a/libfabric.spec b/libfabric.spec
index 03c13a49759e47166b79339d5130f4d629049553..26f7ff14ecec3c050dc589cdcc58cb5ba3039aee 100644
--- a/libfabric.spec
+++ b/libfabric.spec
@@ -1,12 +1,12 @@
 Name:           libfabric
 Version:        1.6.1
-Release:        4
+Release:        5
 Summary:        A core component of OpenFabric Interfaces
 License:        BSD or GPLv2
 URL:            http://ofiwg.github.io/libfabric/
 Source0:        https://github.com/ofiwg/libfabric/releases/download/v%{version}/%{name}-%{version}.tar.bz2
 Patch0001:      backport-libfabric-fix-multiple-definition.patch
-
+Patch0002:      0001-util-mr_cache-Implement-new-MR-caching-path-w-o-merg.patch
 
 BuildRequires:  gcc libibverbs-devel libnl3-devel librdmacm-devel
 %ifarch x86_64
@@ -76,6 +76,9 @@ This contains man files for the using of libfabric.
 
 
 %changelog
+* Thu Oct 19 2023 liubo <liubo1@xfusion.com> - 1.6.1-5
+- util/mr_cache: Implement new MR caching path w/o merging
+
 * Wed Aug 04 2021 Liu Yinsi <liuyinsi@163.com> - 1.6.1-4
 - fix multiple definition to support gcc 10