On 16/11/2020 00:33, Chris Johns wrote:
In the proposal, limits are specified like this:
limits:
sparc/gr712rc:
DirtyCache:
max-upper-bound: 0.000005
mean-upper-bound: 0.000005
FullCache:
max-upper-bound: 0.000005
mean-upper-bound: 0.000005
HotCache:
max-upper-bound: 0.000005
mean-upper-bound: 0.000005
Load/1:
max-upper-bound: 0.00001
mean-upper-bound: 0.00001
Load/2:
max-upper-bound: 0.00001
mean-upper-bound: 0.00001
Load/3:
max-upper-bound: 0.00001
mean-upper-bound: 0.00001
Load/4:
max-upper-bound: 0.00001
mean-upper-bound: 0.00001
This neglects that the limits are subject to a board configuration. One
approach to cover this is the addition of a new BSP provided function:
const char *rtems_get_hardware_performance_hash();
The BSP feeds all performance related data into a hash function and
"data" here means configuration?
Yes, hardware configuration.
Why not make these values part of the BSP configuration? The defaults for the
BSP can have a set of suitable values. Different boards have different
configurations to match and a separate kernel build.
This doesn't work on BSPs which support configuration via a hardware
enumeration, boot loader settings, or device trees. Also changes in the
BSP options have no influence on the BSP name. Not only BSP
configuration influence performance, the CPU options play a role too,
for example RTEMS_SMP. In order to compare performance values over time
we have to obtain the values under the same conditions.
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