-.. BSD LICENSE
- Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
- All rights reserved.
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions
- are met:
-
- * Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
- * Redistributions in binary form must reproduce the above copyright
- notice, this list of conditions and the following disclaimer in
- the documentation and/or other materials provided with the
- distribution.
- * Neither the name of Intel Corporation nor the names of its
- contributors may be used to endorse or promote products derived
- from this software without specific prior written permission.
-
- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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- LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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- THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
+.. SPDX-License-Identifier: BSD-3-Clause
+ Copyright(c) 2010-2014 Intel Corporation.
What does "EAL: map_all_hugepages(): open failed: Permission denied Cannot init memory" mean?
---------------------------------------------------------------------------------------------
Once all the pages are mmapped by an application, they stay that way.
If you start a test application with less than the maximum, then you have free pages.
-When you stop and restart the test application, it looks to see if the pages are available in the ``/dev/huge`` directory and mmaps them.
+When you stop and restart the test application, it looks to see if the pages are available in the ``/dev/hugepages`` directory and mmaps them.
If you look in the directory, you will see ``n`` number of 2M pages files. If you specified 1024, you will see 1024 page files.
These are then placed in memory segments to get contiguous memory.
-If you need to change the number of pages, it is easier to first remove the pages. The usertools/dpdk-setup.sh script provides an option to do this.
-See the "Quick Start Setup Script" section in the :ref:`DPDK Getting Started Guide <linux_gsg>` for more information.
+If you need to change the number of pages, it is easier to first remove the pages.
If I execute "l2fwd -l 0-3 -m 64 -n 3 -- -p 3", I get the following output, indicating that there are no socket 0 hugepages to allocate the mbuf and ring structures to?
If your system has a lot (>1 GB size) of hugepage memory, not all of it will be allocated.
Due to hugepages typically being allocated on a local NUMA node, the hugepages allocation the application gets during the initialization depends on which
NUMA node it is running on (the EAL does not affinitize cores until much later in the initialization process).
-Sometimes, the Linux OS runs the DPDK application on a core that is located on a different NUMA node from DPDK master core and
+Sometimes, the Linux OS runs the DPDK application on a core that is located on a different NUMA node from DPDK main core and
therefore all the hugepages are allocated on the wrong socket.
To avoid this scenario, either lower the amount of hugepage memory available to 1 GB size (or less), or run the application with taskset
-affinitizing the application to a would-be master core.
+affinitizing the application to a would-be main core.
-For example, if your EAL coremask is 0xff0, the master core will usually be the first core in the coremask (0x10); this is what you have to supply to taskset::
+For example, if your EAL coremask is 0xff0, the main core will usually be the first core in the coremask (0x10); this is what you have to supply to taskset::
taskset 0x10 ./l2fwd -l 4-11 -n 2
On application startup, there is a lot of EAL information printed. Is there any way to reduce this?
---------------------------------------------------------------------------------------------------
-Yes, the option ``--log-level=`` accepts one of these numbers:
-
-.. code-block:: c
-
- #define RTE_LOG_EMERG 1U /* System is unusable. */
- #define RTE_LOG_ALERT 2U /* Action must be taken immediately. */
- #define RTE_LOG_CRIT 3U /* Critical conditions. */
- #define RTE_LOG_ERR 4U /* Error conditions. */
- #define RTE_LOG_WARNING 5U /* Warning conditions. */
- #define RTE_LOG_NOTICE 6U /* Normal but significant condition. */
- #define RTE_LOG_INFO 7U /* Informational. */
- #define RTE_LOG_DEBUG 8U /* Debug-level messages. */
-
-It is also possible to change the default level at compile time
-with ``CONFIG_RTE_LOG_LEVEL``.
+Yes, the option ``--log-level=`` accepts either symbolic names (or numbers):
+1. emergency
+2. alert
+3. critical
+4. error
+5. warning
+6. notice
+7. info
+8. debug
How can I tune my network application to achieve lower latency?
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git.droids-corp.org / dpdk.git / blobdiff