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Due to internal glibc limitations [1], DPDK may exhaust internal file descriptor limits when using smaller page sizes, which results in inability to use system calls such as select() by user applications. Single file segments option stores lock files per page to ensure that pages are deleted when there are no more users, however this is not necessary because the processes will be holding onto the pages anyway because of mmap(). Thus, removing pages from the filesystem is safe even though they may be used by some other secondary process. As a result, single file segments mode no longer stores inordinate amounts of segment fd's, and the above issue with fd limits is solved. However, this will not work for legacy mem mode. For that, simply document that using bigger page sizes is the only option. [1] https://mails.dpdk.org/archives/dev/2019-February/124386.html Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com> |
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