[dpdk-users] Secondary process try to map hugepage even with --no-huge

[Tan, Jianfeng]

Hi,

> -----Original Message-----
> From: users [mailto:users-bounces at dpdk.org] On Behalf Of
> tom.barbette at ulg.ac.be
> Sent: Wednesday, July 5, 2017 9:58 PM
> To: users at dpdk.org
> Cc: Gonzalez Monroy, Sergio
> Subject: [dpdk-users] Secondary process try to map hugepage even with --
> no-huge
> 
> Hi list,
> 
> I've got a primary/secondary application that works with huge pages enabled
> but not with "--no-huge". The secondary application try to
> access .rte_hugepage_info no matter the "--no-huge" being passed to both
> master and slave.

So far if --no-huge is used, we are mmap anonymous memory, which makes it not possible to share the memory with secondary (always refer to a config file, open and mmap to the same addr).

And we did not write anything into config file if we use --no-huge. This is a limitation for now.

> 
> This is especially important for functional regression test where I cannot use
> huge pages or sudo (like Travis, Gitlab CI, ...)
> 
> Trying with the simple_mp example :
>  ./simple_mp --no-huge -m 128MB --proc-type=secondary --
> EAL: Detected 8 lcore(s)
> EAL: Probing VFIO support...
> EAL: Could not mmap /home/tom/.rte_hugepage_info
> PANIC in rte_eal_init():
> Cannot init memory
> 6: [./simple_mp(_start+0x2a) [0x43512a]]
> 5: [/lib64/libc.so.6(__libc_start_main+0xf1) [0x7ffff6ed4401]]
> 4: [./simple_mp(main+0x6) [0x4347b6]]
> 3: [./simple_mp(rte_eal_init+0xe90) [0x46e2d0]]
> 2: [./simple_mp(__rte_panic+0xbe) [0x4301ab]]
> 1: [./simple_mp(rte_dump_stack+0x16) [0x475c06]]
> zsh: abort (core dumped)  ./simple_mp --no-huge --proc-type=secondary --
> 
> 
> With sudo, I get a little further, I guess this is not the problem.
> EAL: Could not mmap /dev/hugepages/rtemap_53
> PANIC in rte_eal_init():
> 
> Thanks,
> 
> Tom