netdev - Re: [PATCH v2] selftests/bpf: enlarge select() timeout for test

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Date:   Thu, 19 Aug 2021 01:21:34 +0000
From:   Song Liu <songliubraving@...com>
To:     Li Zhijian <lizhijian@...fujitsu.com>
CC:     Shuah Khan <shuah@...nel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "ast@...nel.org" <ast@...nel.org>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        "andrii@...nel.org" <andrii@...nel.org>, Martin Lau <kafai@...com>,
        Yonghong Song <yhs@...com>,
        "kpsingh@...nel.org" <kpsingh@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "philip.li@...el.com" <philip.li@...el.com>,
        "yifeix.zhu@...el.com" <yifeix.zhu@...el.com>,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH v2] selftests/bpf: enlarge select() timeout for test_maps



> On Aug 18, 2021, at 6:15 PM, Li Zhijian <lizhijian@...fujitsu.com> wrote:
> 
> 0Day robot observed that it's easily timeout on a heavy load host.
> -------------------
> # selftests: bpf: test_maps
> # Fork 1024 tasks to 'test_update_delete'
> # Fork 1024 tasks to 'test_update_delete'
> # Fork 100 tasks to 'test_hashmap'
> # Fork 100 tasks to 'test_hashmap_percpu'
> # Fork 100 tasks to 'test_hashmap_sizes'
> # Fork 100 tasks to 'test_hashmap_walk'
> # Fork 100 tasks to 'test_arraymap'
> # Fork 100 tasks to 'test_arraymap_percpu'
> # Failed sockmap unexpected timeout
> not ok 3 selftests: bpf: test_maps # exit=1
> # selftests: bpf: test_lru_map
> # nr_cpus:8
> -------------------
> Since this test will be scheduled by 0Day to a random host that could have
> only a few cpus(2-8), enlarge the timeout to avoid a false NG report.
> 
> In practice, i tried to pin it to only one cpu by 'taskset 0x01 ./test_maps',
> and knew 10S is likely enough, but i still perfer to a larger value 30.
> 
> Reported-by: kernel test robot <lkp@...el.com>
> Signed-off-by: Li Zhijian <lizhijian@...fujitsu.com>

Acked-by: Song Liu <songliubraving@...com>