Hi Louie, Can you check whether your num_possible_cpu == num_online_cpu? by doing: cat /sys/devices/system/cpu/possible and see how many cpu[0-9] ls /sys/devices/system/cpu/cpu*
There is a related discussion here: https://www.mail-archive.com/netdev@vger.kernel.org/msg121258.html Regards, William On Sun, Oct 2, 2016 at 3:55 PM, Louie Lu <louie...@hopebaytech.com> wrote: > Hi everyone, > > I'm now playing net-next samples/bpf things, and I found that > test_maps will give an assertion > > ``` > test_maps: /home/grd/linux/net-next/samples/bpf/test_maps.c:146: > test_percpu_hashmap_sanity: Assertion `bpf_lookup_elem(map_fd, &key, > value) == -1 && errno == ENOENT' failed. > [1] 20706 abort (core dumped) ./test_maps > ``` > > I've done the check at [[iovisor-dev] Assertion fails at > samples/bpf/test_maps](http://lists.iovisor.org/pipermail/iovisor-dev/2016-June/000281.html) > which tells me to set ulimit to unlimited or patching by setrlimit(). > > The problem is bpf_lookup_elem return -1, and errno return 0. > > I'm using Intel(R) Core(TM) i7-2640M and net-next commit: > 803783849fed11, 4.8.0-rc7-ARCH-02283-g8037838. > > And, a strange this is when I done this at QEMU, test_maps perform > will and pass the test. > > Is that my hardware problem or something else? > > > Thanks. > > Louie Lu.
