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IXP400 Software
Access-Layer Components: Performance Profiling (IxPerfProfAcc) API
Programmer’s Guide IXP400 Software Version 2.0 April 2005
Document Number: 252539, Revision: 007 259
As this file system is temporary, the user is required to copy the output file into a permanent
location or else the results will be lost when a new round of sampling is done or when the system is
stopped or rebooted.
Sample file output for Linux is as follows:
VxWorks output is identical, but also includes a Percent column. In Linux, the user is also able to
change the accuracy of matching the PC Address to the Symbol Address. The greater the accuracy
required, the longer it takes to find a match. The recommended accuracy is 0xffff which means the
module will reduce the PC Address by up to 0xffff until it can find a match. Else, a message is
logged and “No symbol found” is written to the file. The accuracy can be changed by modifying
the #define IX_PERFPROF_ACC_XSCALE_PMU_SYMBOL_ACCURACY.
The output filename is defined in IxPerfProfAcc. To use a different filename, the user is required to
change the filename in the stop function for vxWorks or the
ixPerfProfAccXscalePmuTimeSampCreateProcFile() function in Linux.
Note: The Linux proc file create API is declared public so that it can be called by the /proc file
system. It should never be called directly by the user.
Total Number of Samples for Event1 = 0
Hits PC Address Symbol Address Offset Routine
------- ---------- -------------- ------ -------------------
Total Number of Samples for Event2 = 0
Hits PC Address Symbol Address Offset Routine
------- ---------- -------------- ------ -------------------
Total Number of Samples for Event3 = 65535
Hits PC Address Symbol Address Offset Routine
------- ------------ ------------ ------ -------------------------------------------
21814 c004dd38 c004dac4 274 schedule [Module - kernel]
21381 c0058cac c0058c7c 30 add_timer [Module - kernel]
21329 c00594a4 c005949c 8 schedule_timeout [Module - kernel]
189 c0058c84 c0058c7c 8 add_timer [Module - kernel]
124 c0059520 c005949c 84 schedule_timeout [Module - kernel]
95 c00594a8 c005949c c schedule_timeout [Module - kernel]
Total Number of Samples for Event4 = 6
Hits PC Address Symbol Address Offset Routine
----- ----------- ------- --------------- -------------------
5 c004dd38 c004dac4 274 schedule [Module - kernel]
1 c0112788 0 c0112788 No lower symbol found. [Module - kernel]