diff --git a/.cirun.yml b/.cirun.yml
index bfc6494d05..0d979ba0f2 100644
--- a/.cirun.yml
+++ b/.cirun.yml
@@ -6,7 +6,7 @@ runners:
     cloud: "aws"
     region: "us-east-1"
     # Cheapest VM on AWS
-    instance_type: "c7g.large"
+    instance_type: "c8g.large"
     # Ubuntu-22.04, ami image
     machine_image: "ami-0a0c8eebcdd6dcbd0"
     preemptible: false
diff --git a/.github/workflows/arm64_graviton.yml b/.github/workflows/arm64_graviton.yml
index 6928312b56..223bdd33cc 100644
--- a/.github/workflows/arm64_graviton.yml
+++ b/.github/workflows/arm64_graviton.yml
@@ -88,6 +88,7 @@ jobs:
         run: |
           case "${{ matrix.build }}" in
             "make")
+              sed -i -e "s/while (nthreads_m/if(0)while (nthreads_m/" driver/level3/level3_thread.c
               make -j$(nproc) DYNAMIC_ARCH=1 USE_OPENMP=0 FC="ccache ${{ matrix.fortran }}"
               ;;
             "cmake")
@@ -119,15 +120,18 @@ jobs:
           case "${{ matrix.build }}" in
             "make")
               MAKE_FLAGS='DYNAMIC_ARCH=1 USE_OPENMP=0'
-              echo "::group::Tests in 'test' directory"
-              make -C test $MAKE_FLAGS FC="ccache ${{ matrix.fortran }}"
-              echo "::endgroup::"
-              echo "::group::Tests in 'ctest' directory"
-              make -C ctest $MAKE_FLAGS FC="ccache ${{ matrix.fortran }}"
-              echo "::endgroup::"
-              echo "::group::Tests in 'utest' directory"
-              make -C utest $MAKE_FLAGS FC="ccache ${{ matrix.fortran }}"
-              echo "::endgroup::"
+              wget https://gist.github.com/martin-frbg/96d2252fbb71d0d898ede14691b51657/raw/5c6a89cb1560dce50005dd8484483508fabc039f/issue4939.c
+              gcc -I. -O2 issue4939.c libopenblas.a -lgfortran -lm -o issue4939
+              ./issue4939
+              #echo "::group::Tests in 'test' directory"
+              #make -C test $MAKE_FLAGS FC="ccache ${{ matrix.fortran }}"
+              #echo "::endgroup::"
+              #echo "::group::Tests in 'ctest' directory"
+              #make -C ctest $MAKE_FLAGS FC="ccache ${{ matrix.fortran }}"
+              #echo "::endgroup::"
+              #echo "::group::Tests in 'utest' directory"
+              #make -C utest $MAKE_FLAGS FC="ccache ${{ matrix.fortran }}"
+              #echo "::endgroup::"
               ;;
             "cmake")
               cd build && ctest
diff --git a/interface/gemm.c b/interface/gemm.c
index 576e94593c..4b290437f6 100644
--- a/interface/gemm.c
+++ b/interface/gemm.c
@@ -566,7 +566,11 @@ void CNAME(enum CBLAS_ORDER order, enum CBLAS_TRANSPOSE TransA, enum CBLAS_TRANS
 
 #if USE_SMALL_MATRIX_OPT
 #if !defined(COMPLEX)
+#if defined(ARCH_ARM64)
+  if(args.m*args.n*args.k<=64*64*64){
+#else
   if(GEMM_SMALL_MATRIX_PERMIT(transa, transb, args.m, args.n, args.k, *(FLOAT *)(args.alpha), *(FLOAT *)(args.beta))){
+#endif	  
 	  if(*(FLOAT *)(args.beta) == 0.0){
 		(GEMM_SMALL_KERNEL_B0((transb << 2) | transa))(args.m, args.n, args.k, args.a, args.lda, *(FLOAT *)(args.alpha), args.b, args.ldb, args.c, args.ldc);
 	  }else{
diff --git a/param.h b/param.h
index fee9195d02..6392421773 100644
--- a/param.h
+++ b/param.h
@@ -3548,10 +3548,8 @@ is a big desktop or server with abundant cache rather than a phone or embedded d
 
 #if defined(XDOUBLE) || defined(DOUBLE)
 #define SWITCH_RATIO            8
-#define GEMM_PREFERED_SIZE      4
 #else
 #define SWITCH_RATIO            16
-#define GEMM_PREFERED_SIZE      8
 #endif
 
 #define SGEMM_DEFAULT_UNROLL_M  16