Re: [dpdk-dev] eal: DPDK: 18.11.6 version rte_eal_init() function cleans the runtime directory in 5.4.35 kernel

["Mohakud, Amiya Ranjan" <amohakud@rbbn.com>]

Hi Anatoly - Thanks for helping on this.

I am not aware, where the primary process re-creates the files. Can you please point me to that? As per my code browsing and understanding, I can see, fbarray_memzone file gets created in rte_eal_memzone_init()->rte_fbarray_init() and it stays there till eal_clean_runtime_dir() gets called towards end of rte_eal_init(). This does not get deleted in 4.19 kernel, but in 5.4, it does.

I'm not sure i understand. Primary process is supposed to clear the
files. It will then recreate them. Are you suggesting that it's clearing
them *after* it has created them?

Going by my observation, the file highlighted below gets deleted by the time rte_eal_init() is over.

srwxr-xr-x 1 root root      0 Oct 15 11:24 mp_socket
-rw------- 1 root root  12432 Oct 15 11:24 hugepage_info
-rw------- 1 root root 188416 Oct 15 11:24 fbarray_memzone
-rw------- 1 root root 397312 Oct 15 11:24 fbarray_memseg-2048k-0-1
-rw------- 1 root root 397312 Oct 15 11:24 fbarray_memseg-2048k-0-0
-rw------- 1 root root 397312 Oct 15 11:24 fbarray_memseg-2048k-0-3
-rw------- 1 root root 397312 Oct 15 11:24 fbarray_memseg-2048k-0-2
-rw------- 1 root root  16529 Oct 15 11:24 config


Please reach out to me for further clarification.

Regards
Amiya
From: Burakov, Anatoly <anatoly.burakov@intel.com>
Sent: 15 October 2020 20:39
To: Mohakud, Amiya Ranjan <amohakud@rbbn.com>; dpdk-dev <dev@dpdk.org>
Subject: Re: [dpdk-dev] eal: DPDK: 18.11.6 version rte_eal_init() function cleans the runtime directory in 5.4.35 kernel

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On 15-Oct-20 3:43 PM, Mohakud, Amiya Ranjan wrote:
> The primary process does not clear the files ( e.g.
> /var/run/dpdk/rte/fbarray_*) in case of 4.19 kernel, since the flock()
> fails. I think, this is correct behavior, since secondary processes rely
> on those files for their memzone_init().
>
> But in 5.4, the primary process clears these files, which cause
> secondary processes to fail.

I'm not sure i understand. Primary process is supposed to clear the
files. It will then recreate them. Are you suggesting that it's clearing
them *after* it has created them?

--
Thanks,
Anatoly