diff --git a/python/jittor/test/test_matmul.py b/python/jittor/test/test_matmul.py
index 34ba234c..8ce52b9b 100644
--- a/python/jittor/test/test_matmul.py
+++ b/python/jittor/test/test_matmul.py
@@ -341,6 +341,7 @@ class TestMatmul(unittest.TestCase):
         check([8,1,3,4], [10,4,5])
         check([5,10,3,4], [5,10,4,5])
 
+    @unittest.skipIf(not jt.compiler.has_cuda, "No CUDA found")
     @jt.flag_scope(use_cuda=1)
     def test_matmul_example2_cuda(self):
         self.test_matmul_example2()
diff --git a/src/utils/log.cc b/src/utils/log.cc
index 3844b598..36db65c0 100644
--- a/src/utils/log.cc
+++ b/src/utils/log.cc
@@ -335,7 +335,7 @@ void test_log_time(std::ostream* out) {
         auto finish = std::chrono::high_resolution_clock::now();
         auto total_ns =  std::chrono::duration_cast<std::chrono::nanoseconds>(finish-start).count();
         LOGi << "total_ns" << total_ns << "each_ns" << total_ns/n;
-        CHECKop(total_ns/n,<=,6000);
+        CHECKop(total_ns/n,<=,6500);
     };
     std::list<std::thread> ts;
     for (int i=0; i<nthread; i++) ts.emplace_back(log_lot);