RFR [XS]: 8229370: make jdk/jfr/event/runtime/TestNetworkUtilizationEvent.java more stable

[David Holmes]

On 29/08/2019 12:24 am, Baesken, Matthias wrote:
> Hi David ,   I could  add some  optional  UL logging  to see   what happens.

I just want to see more visibility at the test level to ensure it is 
finding the interfaces and addresses I would expect it to find.

David

> Maybe the  OS counters   that are fetched by   os_perf    are not that reliable on some  kernels .
> 
> 
> Best regards, Matthias
> 
> 
> 
>>
>> Hi Matthias,
>>
>> On 28/08/2019 10:02 pm, Baesken, Matthias wrote:
>>> Hi David,   thanks for reaching out to the net folks.
>>>
>>> I use now the  stream of InetAddresses   from
>> NetworkInterface.networkInterfaces().flatMap(NetworkInterface::inetAddr
>> esses)  ;
>>>
>>> However on the machine  where  I noticed the issue ,   I still have to do a
>> couple of retries .
>>> Just one  send to the stream of InetAddresses   from
>> NetworkInterface.networkInterfaces().flatMap(NetworkInterface::inetAddr
>> esses)    does not always give
>>>     the expected result ☹ .
>>
>> That doesn't make sense to me, if one of the interfaces is the real
>> network interface and we write to the real IP address. I think we need
>> to add some diagnostics to see exactly which interface and IP address we
>> are writing to, and then see what each interface reports on the read
>> back of the data.
>>
>> Thanks,
>> David
>>
>>> New webrev :
>>>
>>> http://cr.openjdk.java.net/~mbaesken/webrevs/8229370.2/
>>>
>>>
>>> Thanks, Matthias
>>>
>