| Index: client/tests/kvm/tests/jumbo.py
 | 
| diff --git a/client/tests/kvm/tests/jumbo.py b/client/tests/kvm/tests/jumbo.py
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| index 1fbce8b67c7f1e5f2cdb7112fe49b8f380d3a46c..2c91c839071b9d65d6338c7141f66d8d5d48c06b 100644
 | 
| --- a/client/tests/kvm/tests/jumbo.py
 | 
| +++ b/client/tests/kvm/tests/jumbo.py
 | 
| @@ -40,7 +40,11 @@ def run_jumbo(test, params, env):
 | 
|  
 | 
|          logging.info("Changing the MTU of guest ...")
 | 
|          guest_mtu_cmd = "ifconfig %s mtu %s" % (ethname , mtu)
 | 
| -        session.cmd(guest_mtu_cmd)
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| +        s, o = session.get_command_status_output(guest_mtu_cmd)
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| +        if s != 0:
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| +            logging.error(o)
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| +            raise error.TestError("Fail to set the MTU of guest NIC: %s" %
 | 
| +                                  ethname)
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|  
 | 
|          logging.info("Chaning the MTU of host tap ...")
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|          host_mtu_cmd = "ifconfig %s mtu %s" % (ifname, mtu)
 | 
| 
 |