netdev - Re: [PATCH net-next] selftests: fib_nexthops: Make the test more robust

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Date:   Mon, 16 May 2022 21:15:26 -0600
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Amit Cohen <amcohen@...dia.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Cc:     "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "shuah@...nel.org" <shuah@...nel.org>, mlxsw <mlxsw@...dia.com>,
        "dsahern@...nel.org" <dsahern@...nel.org>,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH net-next] selftests: fib_nexthops: Make the test more
 robust

On 5/15/22 8:26 AM, Amit Cohen wrote:
> 
> 
>> -----Original Message-----
>> From: Shuah Khan <skhan@...uxfoundation.org>
>> Sent: Thursday, May 12, 2022 7:40 PM
>> To: Amit Cohen <amcohen@...dia.com>; netdev@...r.kernel.org
>> Cc: davem@...emloft.net; edumazet@...gle.com; kuba@...nel.org; pabeni@...hat.com; shuah@...nel.org; mlxsw
>> <mlxsw@...dia.com>; dsahern@...nel.org; Shuah Khan <skhan@...uxfoundation.org>
>> Subject: Re: [PATCH net-next] selftests: fib_nexthops: Make the test more robust
>>
>> On 5/12/22 9:17 AM, Amit Cohen wrote:
>>>
>>>
>>>> -----Original Message-----
>>>> From: Shuah Khan <skhan@...uxfoundation.org>
>>>> Sent: Thursday, May 12, 2022 5:28 PM
>>>> To: Amit Cohen <amcohen@...dia.com>; netdev@...r.kernel.org
>>>> Cc: davem@...emloft.net; edumazet@...gle.com; kuba@...nel.org; pabeni@...hat.com; shuah@...nel.org; mlxsw
>>>> <mlxsw@...dia.com>; Shuah Khan <skhan@...uxfoundation.org>
>>>> Subject: Re: [PATCH net-next] selftests: fib_nexthops: Make the test more robust
>>>>
>>>> On 5/12/22 7:12 AM, Amit Cohen wrote:
>>>>> Rarely some of the test cases fail. Make the test more robust by increasing
>>>>> the timeout of ping commands to 5 seconds.
>>>>>
>>>>
>>>> Can you explain why test cases fail?
>>>
>>> The failures are probably caused due to slow forwarding performance.
>>> You can see similar commit - b6a4fd680042 ("selftests: forwarding: Make ping timeout configurable").
>>>
>>
>> My primary concern is that this patch simply changes the value
>> and doesn't make it configurable. Sounds like the above commit
>> does that. Why not use the same approach to keep it consistent.
>>
>>>>
>>>>> Signed-off-by: Amit Cohen <amcohen@...dia.com>
>>>>> ---
>>>>>     tools/testing/selftests/net/fib_nexthops.sh | 48 ++++++++++-----------
>>>>>     1 file changed, 24 insertions(+), 24 deletions(-)
>>>>>
>>>>> diff --git a/tools/testing/selftests/net/fib_nexthops.sh b/tools/testing/selftests/net/fib_nexthops.sh
>>>>> index b3bf5319bb0e..a99ee3fb2e13 100755
>>>>> --- a/tools/testing/selftests/net/fib_nexthops.sh
>>>>> +++ b/tools/testing/selftests/net/fib_nexthops.sh
>>>>> @@ -882,13 +882,13 @@ ipv6_fcnal_runtime()
>>>>>     	log_test $? 0 "Route delete"
>>>>>
>>>>>     	run_cmd "$IP ro add 2001:db8:101::1/128 nhid 81"
>>>>> -	run_cmd "ip netns exec me ping -c1 -w1 2001:db8:101::1"
>>>>> +	run_cmd "ip netns exec me ping -c1 -w5 2001:db8:101::1"
>>>>>     	log_test $? 0 "Ping with nexthop"
>>>>>
>>>> Looks like the change uses "-w deadline" - "-W timeout" might
>>>> be a better choice if ping fails with no response?
>>>
>>> We usually use "-w" in ping commands in selftests, but I can change it if you prefer "-W".
>>>
>>
>> I will defer to networking experts/maintainers on the choice of
>> -w vs -W
>>
>> I would like to see the timeout configurable.
> 
> If you feel strongly about that, I can send another patch to make it configurable.
> Personally, I don't think that someone will use it, and from our experience, 5 seconds seems to be enough.
> 

Please make this configurable. It will be consistent with other tests.

thanks,
-- Shuah