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.. Copyright (c) <2010>, Intel Corporation
All rights reserved.
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modification, are permitted provided that the following conditions
are met:
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notice, this list of conditions and the following disclaimer.
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OF THE POSSIBILITY OF SUCH DAMAGE.
=============
Timer example
=============
This example shows how timer can be used in a RTE application. This
program print some messages from different lcores regularly,
demonstrating how to use timers.
Support igb_uio and vfio driver, if used vfio, kernel need 3.6+ and enable vt-d in bios.
When used vfio , used "modprobe vfio" and "modprobe vfio-pci" insmod vfiod driver, then used
"./tools/dpdk_nic_bind.py --bind=vfio-pci device_bus_id" to bind vfio driver to test driver.
In the timer example there are two timers.
Timer 0 is periodical, running on the master lcore,
reloaded automatically every second.
Timer 1 is single one, being loaded manually by every second/3 ,
once manually load will switch to next lcore.
Usage of application::
./timer [EAL options]
[EAL options]::
EAL option list:
-c COREMASK: hexadecimal bitmask of cores we are running on
-m MB : memory to allocate (default = size of hugemem)
-n NUM : force number of memory channels (don't detect)
-r NUM : force number of memory ranks (don't detect)
--huge-file: base filename for hugetlbfs entries
debug options:
--no-huge : use malloc instead of hugetlbfs
--no-pci : disable pci
--no-hpet : disable hpet
--no-shconf: no shared config (mmap'd files)
Prerequisites
=============
To find out the mapping of lcores (processor) to core id and socket
(physical id), the command below can be used::
$ grep "processor\|physical id\|core id\|^$" /proc/cpuinfo
The number of logical core will be used as parameter to the timer example.
Test Case: timer callbacks running on targeted cores
====================================================
To run the example in linuxapp environment ::
./timer -c ffffff
Timer0, every second, on master lcore, reloaded automatically.
The check output as below by every second on master lcore::
timer0_cb() on lcore 0
Timer1, every second/3, on next lcore, reloaded manually.
The check output as below by every second/3 on master lcore::
timer1_cb() on lcore 1
timer1_cb() on lcore 2
timer1_cb() on lcore 3
timer1_cb() on lcore 4
...
...
...
timer1_cb() on lcore 23
Verfity the ``timer0_cb`` and ``timer1_cb`` care called properly
on the target cores.
..
Don't add the accuracy test for timer example.
It makes no sense if there is no timestamp on the timer callback.
If it's suitable to have accuracy test in the furture,
a report table will be given.
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