netdev - Re: [PATCH net 1/3] selftests: tc: set timeout to 15 minutes

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Date: Fri, 14 Jul 2023 14:49:01 -0300
From: Pedro Tammela <pctammela@...atatu.com>
To: shaozhengchao <shaozhengchao@...wei.com>,
 Matthieu Baerts <matthieu.baerts@...sares.net>,
 Jamal Hadi Salim <jhs@...atatu.com>, Cong Wang <xiyou.wangcong@...il.com>,
 Jiri Pirko <jiri@...nulli.us>, Shuah Khan <shuah@...nel.org>,
 Kees Cook <keescook@...omium.org>, "David S. Miller" <davem@...emloft.net>,
 Paul Blakey <paulb@...lanox.com>,
 Marcelo Ricardo Leitner <marcelo.leitner@...il.com>, mptcp@...ts.linux.dev
Cc: Shuah Khan <skhan@...uxfoundation.org>, linux-kernel@...r.kernel.org,
 netdev@...r.kernel.org, linux-kselftest@...r.kernel.org,
 stable@...r.kernel.org
Subject: Re: [PATCH net 1/3] selftests: tc: set timeout to 15 minutes

On 13/07/2023 23:25, shaozhengchao wrote:
> 
> 
> On 2023/7/14 5:16, Matthieu Baerts wrote:
>> When looking for something else in LKFT reports [1], I noticed that the
>> TC selftest ended with a timeout error:
>>
>>    not ok 1 selftests: tc-testing: tdc.sh # TIMEOUT 45 seconds
>>
>> The timeout had been introduced 3 years ago, see the Fixes commit below.
>>
>> This timeout is only in place when executing the selftests via the
>> kselftests runner scripts. I guess this is not what most TC devs are
>> using and nobody noticed the issue before.
>>
>> The new timeout is set to 15 minutes as suggested by Pedro [2]. It looks
>> like it is plenty more time than what it takes in "normal" conditions.
>>
>> Fixes: 852c8cbf34d3 ("selftests/kselftest/runner.sh: Add 45 second 
>> timeout per test")
>> Cc: stable@...r.kernel.org
>> Link: 
>> https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20230711/testrun/18267241/suite/kselftest-tc-testing/test/tc-testing_tdc_sh/log [1]
>> Link: 
>> https://lore.kernel.org/netdev/0e061d4a-9a23-9f58-3b35-d8919de332d7@tessares.net/T/ [2]
>> Suggested-by: Pedro Tammela <pctammela@...atatu.com>
>> Signed-off-by: Matthieu Baerts <matthieu.baerts@...sares.net>
>> ---
>>   tools/testing/selftests/tc-testing/settings | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/tools/testing/selftests/tc-testing/settings 
>> b/tools/testing/selftests/tc-testing/settings
>> new file mode 100644
>> index 000000000000..e2206265f67c
>> --- /dev/null
>> +++ b/tools/testing/selftests/tc-testing/settings
>> @@ -0,0 +1 @@
>> +timeout=900
>>
> I remember last year when I tested all the tdc cases（qdisc + filter +
> action + infra） in my vm machine, it took me nearly 20 minutes.
> So I think it should be more than 1200 seconds if all cases need to be
> tested.
> 
> Maybe we should really optimize the parallel execution process of tdc.

Let's try to spend some cycles improving the tdc code performance first.
TDC boils down essentially to:
- Setup namespace (if needed)
- Setup network interfaces
- Spawn a few processes
- Match a regex
- Bring down namespace

Nothing above screams expensive, so I'm sure there are some low hanging 
fruits to improve the overall wall time even in debug kernels.