On Tue, Jun 21, 2016 at 11:03 AM, William Tu via iovisor-dev
<[email protected]> wrote:
> Hi,
>
> I'm trying to run sockex2 and sockex3 but got the error:
> [root@vm-dev bpf]# ./sockex2
> failed to create a map: 1 Operation not permitted
>
> Then I found that I have max locked memory set to 64K, after reconfig
> to unlimited then the bpf map is created and sockex2/3 works fine.
> The hash_map created in sockex2_kern.c should be less than 64k (1024
> entry * (sizeof (__be32) + sizeof(struct pair)), so I don't understand
> why increasing max locked memory solves the error.
kernel counts the real cost of the map including kernel internal fields.
See htab_map_alloc()
>
> Or should we increase the lock memory in the beginning?
>
> --- a/samples/bpf/sockex2_user.c
> +++ b/samples/bpf/sockex2_user.c
> @@ -1,4 +1,5 @@
> #include <stdio.h>
> +#include <sys/resource.h>
> #include <assert.h>
> #include <linux/bpf.h>
> #include "libbpf.h"
> @@ -13,11 +14,13 @@ struct pair {
>
> int main(int ac, char **argv)
> {
> + struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
> char filename[256];
> FILE *f;
> int i, sock;
>
> snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
> + setrlimit(RLIMIT_MEMLOCK, &r);
yes. we started to use that it most of the new tests.
pls send the official patch to netdev.
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