[dpdk-dev] rte_mempool_create fails with ENOMEM

[Newman Poborsky]

Hi,

could someone please provide any explanation why sometimes mempool creation
fails with ENOMEM?

I run my test app several times without any problems and then I start
getting ENOMEM error when creating mempool that are used for packets. I try
to delete everything from /mnt/huge, I increase the number of huge pages,
remount /mnt/huge but nothing helps.

There is more than enough memory on server. I tried to debug
rte_mempool_create() call and it seems that after server is restarted free
mem segments are bigger than 2MB, but after running test app for several
times, it seems that all free mem segments have a size of 2MB, and since I
am requesting 8MB for my packet mempool, this fails.  I'm not really sure
that this conclusion is correct.

Does anybody have any idea what to check and how running my test app
several times affects hugepages?

For me, this doesn't make any since because after test app exits, resources
should be freed, right?

This has been driving me crazy for days now. I tried reading a bit more
theory about hugepages, but didn't find out anything that could help me.
Maybe it's something else and completely trivial, but I can't figure it
out, so any help is appreciated.

Thank you!

BR,
Newman P.