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Diffstat (limited to 'doc/guides/prog_guide/writing_efficient_code.rst')
| -rw-r--r-- | doc/guides/prog_guide/writing_efficient_code.rst | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/doc/guides/prog_guide/writing_efficient_code.rst b/doc/guides/prog_guide/writing_efficient_code.rst index 8223acee..d7ac6778 100644 --- a/doc/guides/prog_guide/writing_efficient_code.rst +++ b/doc/guides/prog_guide/writing_efficient_code.rst @@ -105,6 +105,21 @@ meaning that if all memory access operations are done on the first channel only, By default, the :ref:`Mempool Library <Mempool_Library>` spreads the addresses of objects among memory channels. +Locking memory pages +~~~~~~~~~~~~~~~~~~~~ + +The underlying operating system is allowed to load/unload memory pages at its own discretion. +These page loads could impact the performance, as the process is on hold when the kernel fetches them. + +To avoid these you could pre-load, and lock them into memory with the ``mlockall()`` call. + +.. code-block:: c + + if (mlockall(MCL_CURRENT | MCL_FUTURE)) { + RTE_LOG(NOTICE, USER1, "mlockall() failed with error \"%s\"\n", + strerror(errno)); + } + Communication Between lcores ---------------------------- |