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[idd] scheduler: detect high-rate cadence breaks

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Keep the client schedule floor at 2 ms while accepting shorter guest
frame intervals for cadence tracking. This lets sources above 500 Hz
trigger immediate final-frame delivery when their cadence breaks.
This commit is contained in:
Geoffrey McRae
2026-08-06 12:13:02 +10:00
parent da7d6b4011
commit c56b10b194
1 changed files with 11 additions and 9 deletions
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20
idd/LGIdd/CFrameScheduler.cpp
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@@ -22,13 +22,14 @@
#include "CDebug.h"
static const uint64_t MIN_PERIOD_NS = 2000000ULL;
static const uint64_t MAX_PERIOD_NS = 1000000000ULL;
static const uint32_t MIN_LEASE_MS = 100;
static const uint32_t MAX_LEASE_MS = 5000;
static const uint64_t MIN_SAFETY_NS = 250000ULL;
static const uint64_t LOG_INTERVAL_NS = 5000000000ULL;
static const uint64_t CADENCE_BREAK = 4;
static const uint64_t MIN_SOURCE_PERIOD_NS = 100000ULL;
static const uint64_t MIN_SCHEDULE_PERIOD_NS = 2000000ULL;
static const uint64_t MAX_PERIOD_NS = 1000000000ULL;
static const uint32_t MIN_LEASE_MS = 100;
static const uint32_t MAX_LEASE_MS = 5000;
static const uint64_t MIN_SAFETY_NS = 250000ULL;
static const uint64_t LOG_INTERVAL_NS = 5000000000ULL;
static const uint64_t CADENCE_BREAK = 4;
CFrameScheduler::CFrameScheduler()
{
@@ -310,7 +311,7 @@ bool CFrameScheduler::UpdateSchedule(uint32_t sourceClientID,
}
if (!(schedule.flags & KVMFR_FRAME_SCHEDULE_ACTIVE) ||
schedule.period < MIN_PERIOD_NS ||
schedule.period < MIN_SCHEDULE_PERIOD_NS ||
schedule.period > MAX_PERIOD_NS ||
schedule.targetSlack >= schedule.period ||
schedule.phaseError > static_cast<int64_t>(schedule.period) ||
@@ -456,7 +457,8 @@ void CFrameScheduler::ObserveFrame(uint64_t now)
m_guestPeriod = 0;
m_forceNext = true;
}
else if (interval >= MIN_PERIOD_NS && interval <= MAX_PERIOD_NS)
else if (interval >= MIN_SOURCE_PERIOD_NS &&
interval <= MAX_PERIOD_NS)
{
if (!m_guestPeriod)
m_guestPeriod = interval;