tree 3d3ca6b754be3e4ece3ab9026d68ed6719e2d350
parent 38b58f5866602906833f7afc864dd2729516dd7f
author Johnathan Mantey <johnathanx.mantey@intel.com> 1576783755 -0800
committer James Feist <james.feist@linux.intel.com> 1578420549 +0000

Eliminate expensive DBus transaction in Get Device ID

Get Device ID incurred some performance issues at boot time because of
blocking IPMI function calls. This change focuses on using local file
content instead of making DBus calls. It eliminates reading the FRU
contents at boot as the dominant mode, which take quite some time to
complete.

Tested:
Used high_resolution_clock function calls to collect the run time from
start to finish of the ipmiAppGetDeviceId function. Rebooted the
system multiple times, and ran "ipmitool mc info" in a loop 60 times.
Before the change the function could take upwards of 6 seconds to
complete.
After the change the worst case observed was just over 1 second.

Change-Id: Ia8ebd8e21a1b3e2f77e50bdfdd7272dfe51a56ea
Signed-off-by: Johnathan Mantey <johnathanx.mantey@intel.com>