relax max_rate for iperf UL/DL tests

Change-Id: Ia243156931918d5ab013c64c37823bc2e400798e
diff --git a/suites/4g/iperf3_dl.py b/suites/4g/iperf3_dl.py
index c98251b..38a3891 100755
--- a/suites/4g/iperf3_dl.py
+++ b/suites/4g/iperf3_dl.py
@@ -44,6 +44,6 @@
 print_results(iperf3cli.get_results(), iperf3srv.get_results())
 
 max_rate = enb.ue_max_rate(downlink=True)
-res_str = ue.verify_metric(max_rate * 0.9, operation='avg', metric='dl_brate', criterion='gt')
+res_str = ue.verify_metric(max_rate * 0.8, operation='avg', metric='dl_brate', criterion='gt')
 print(res_str)
 test.set_report_stdout(res_str)
diff --git a/suites/4g/iperf3_ul.py b/suites/4g/iperf3_ul.py
index fe963a9..f467696 100755
--- a/suites/4g/iperf3_ul.py
+++ b/suites/4g/iperf3_ul.py
@@ -44,6 +44,6 @@
 print_results(iperf3cli.get_results(), iperf3srv.get_results())
 
 max_rate = enb.ue_max_rate(downlink=False)
-res_str = ue.verify_metric(max_rate * 0.9, operation='avg', metric='ul_brate', criterion='gt')
+res_str = ue.verify_metric(max_rate * 0.8, operation='avg', metric='ul_brate', criterion='gt')
 print(res_str)
 test.set_report_stdout(res_str)