* [spp] [PATCH] docs: add desc for base virtaddr option
@ 2019-02-04 9:47 ogawa.yasufumi
0 siblings, 0 replies; only message in thread
From: ogawa.yasufumi @ 2019-02-04 9:47 UTC (permalink / raw)
To: spp, ferruh.yigit, ogawa.yasufumi; +Cc: Itsuro Oda
From: Yasufumi Ogawa <ogawa.yasufumi@lab.ntt.co.jp>
Secondary process is failed to launch sometimes for mmap. The reason is
secondary tries to reserve mem region already used by primary. To avoid
the issue, user need to use ``--base-virtaddr`` to decide explicitly.
This update is to add this explanation in `How to Use` section.
Signed-off-by: Yasufumi Ogawa <ogawa.yasufumi@lab.ntt.co.jp>
Signed-off-by: Itsuro Oda <oda@valinux.co.jp>
---
docs/guides/setup/howto_use.rst | 53 ++++++++++++++++++++++++++++-------------
1 file changed, 36 insertions(+), 17 deletions(-)
diff --git a/docs/guides/setup/howto_use.rst b/docs/guides/setup/howto_use.rst
index 11aa386..2f3e37f 100644
--- a/docs/guides/setup/howto_use.rst
+++ b/docs/guides/setup/howto_use.rst
@@ -196,8 +196,9 @@ To launch SPP primary, run ``spp_primary`` with specific options.
$ sudo ./src/primary/x86_64-native-linuxapp-gcc/spp_primary \
-l 1 -n 4 \
--socket-mem 512,512 \
- --huge-dir=/dev/hugepages \
- --proc-type=primary \
+ --huge-dir /dev/hugepages \
+ --proc-type primary \
+ --base-virtaddr 0x100000000
-- \
-p 0x03 \
-n 10 \
@@ -207,23 +208,38 @@ SPP primary takes EAL options and application specific options.
Core list option ``-l`` is for assigining cores and SPP primary requires just
one core. You can use core mask option ``-c`` instead of ``-l``.
-
You can use ``-m 1024`` for memory reservation instead of
``--socket-mem 1024,0`` if you use single NUMA node. In this case, 512 MB is
reserved on each of nodes.
.. note::
- Spp primary shows messages in the terminal after launched. However, the
- contents of the message is different for the number of lcores assigned.
+ If you use DPDK v18.08 or before,
+ you should consider give ``--base-virtaddr`` with 4 GiB or higher value
+ because a secondary process is accidentally failed to mmap while init
+ memory. The reason of the failure is secondary process tries to reserve
+ the region which is already used by some of thread of primary.
+
+ .. code-block:: console
+
+ # Failed to secondary
+ EAL: Could not mmap 17179869184 ... - please use '--base-virtaddr' option
+
+ ``--base-virtaddr`` is to decide base address explicitly to avoid this
+ overlapping. 4 GiB ``0x100000000`` is enough for the purpose.
- If you assign two lcores, SPP primary show statistics within
- interval time periodically. On the other hand, just one lcore, it shows
- log messages.
+ If you use DPDK v18.11 or later, ``--base-virtaddr 0x100000000`` is enabled
+ in default. You need to use this option only for changing the default value.
- Anyway, you can retrieve it with ``status`` command of spp_primary.
- The second core of spp_primary is not used for counting
- packets actually, but used just for displaying the statistics.
+
+In general, one lcore is enough for ``spp_primary``. If you give two or
+more, it uses second lcore to display statistics periodically and does not
+use others.
+
+.. note::
+
+ Anyway, you can get statistics in SPP CLI with ``pri; status`` command
+ actually even if you give only one core.
Primary process sets up physical ports of given port mask with ``-p`` option
and ring ports of the number of ``-n`` option. Ports of ``-p`` option is for
@@ -242,6 +258,7 @@ secondary processes.
--vdev eth_vhost1,iface=/tmp/sock1 # used as 1st phy port
--vdev eth_vhost2,iface=/tmp/sock2 # used as 2nd phy port
--proc-type=primary \
+ --base-virtaddr 0x100000000
-- \
-p 0x03 \
-n 10 \
@@ -250,15 +267,16 @@ secondary processes.
- EAL options:
- -l: core list
- - --socket-mem: memory size on each of NUMA nodes
- - --huge-dir: path of hugepage dir
- - --proc-type: process type
+ - --socket-mem: Memory size on each of NUMA nodes.
+ - --huge-dir: Path of hugepage dir.
+ - --proc-type: Process type.
+ - --base-virtaddr: Specify base virtual address.
- Application options:
- - -p: port mask
- - -n: number of ring PMD
- - -s: IP address of controller and port prepared for primary
+ - -p: Port mask.
+ - -n: Number of ring PMD.
+ - -s: IP address of controller and port prepared for primary.
SPP Secondary
@@ -478,6 +496,7 @@ launching DPDK processes.
-m 1024 \
--huge-dir=/dev/hugepages \
--proc-type=primary \
+ --base-virtaddr 0x100000000
-- \
-p 0x03 \
-n 6 \
--
2.7.4
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