Clarification request: what exactly is the t=<x>us field in [SCHED] Slot decisions logs?

[Moussa-Guemdani]

Hi srsRAN team,

Hi all,

While inspecting DU logs I see lines like

2025-06-26T03:00:08.273425 [SCHED ] [I] [ 359.7] Slot decisions pci=1 t=2us (0 PDSCHs, 1 PUSCH): UL: ue=0 rnti=0x4601 h_id=1 ss_id=2 rb=[3..9) newtx=true rv=0 tbs=544 k2=4

Digging into lib/scheduler/logging/scheduler_result_logger.cpp I found:

decision_latency is a std::chrono::microseconds, so it looks like t= is the time the scheduler needed to create the grant list for that slot.

• Can someone from the team confirm that this is indeed scheduler runtime (End-to-end: From slot indication to output) or RB allocation time?
• Where in the code is decision_latency first captured?

Thanks in advance!