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I tried running Ibex small configuration with different workload by turning the Icache parameter on and off (assigning it 0 and 1) this is what I got in the Simulation statistics

Without Cache

Simulation statistics

Executed cycles: 167525
Wallclock time: 8.708 s
Simulation speed: 19238.1 cycles/s (19.2381 kHz)
Trace file size: 5758073 B

With cache

Simulation statistics

Executed cycles: 167525
Wallclock time: 14.255 s
Simulation speed: 11752 cycles/s (11.752 kHz)
Trace file size: 7273683 B

I tested it with different workloads and different configurations available in ibex. it seems like the Executed cycles should be smaller if a cache exists. On top of that it seems the wallclock time takes longer for a configuration with cache.

I also tried decreasing the clock from 0.5 to 0.05 in ibex_simple_system.sv but still the Executed cycles do not change.

My Environment

I am using wsl on windows and I am running ibex simple system on bare metal
I am using ubuntu Ubuntu 22.04.4 LTS

EDA tool and version:

Operating system:

Version of the Ibex source code:

Start with ibex_simple_system.sv and the small configuration's Icache setting, reproducing the reported cache-on and cache-off simulation statistics. Record the Ibex source revision, exact workloads and configurations, and the clock setting; done means explaining whether the differing wallclock time and unchanged executed cycles are expected or indicate a defect.