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Prevent "0" as delta. 

Change-Id: Ic0fae0ff816c6c587eb37b43462455f86cf3628c
Signed-off-by: Michal Mrozek <michal.mrozek@intel.com>
This commit is contained in:
Michal Mrozek 2020-03-12 10:56:12 +01:00
parent 6ce9402fc2
commit ff09ef9263
1 changed files with 2 additions and 2 deletions
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4
shared/source/os_interface/windows/wddm_memory_manager.cpp
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@ -603,7 +603,7 @@ bool WddmMemoryManager::isCpuCopyRequired(const void *ptr) {
timestamp1 = __rdtsc(); timestamp1 = __rdtsc();
_mm_lfence(); _mm_lfence();
localVariableReadDelta = timestamp1 - timestamp0 - meassurmentOverhead; localVariableReadDelta = timestamp1 - timestamp0 - meassurmentOverhead;
if (localVariableReadDelta < 0) { if (localVariableReadDelta <= 0) {
localVariableReadDelta = 1; localVariableReadDelta = 1;
} }
if (localVariableReadDelta < fastestLocalRead) { if (localVariableReadDelta < fastestLocalRead) {
@ -620,7 +620,7 @@ bool WddmMemoryManager::isCpuCopyRequired(const void *ptr) {
timestamp1 = __rdtsc(); timestamp1 = __rdtsc();
_mm_lfence(); _mm_lfence();
inputPointerReadDelta = timestamp1 - timestamp0 - meassurmentOverhead; inputPointerReadDelta = timestamp1 - timestamp0 - meassurmentOverhead;
if (inputPointerReadDelta < 0) { if (inputPointerReadDelta <= 0) {
inputPointerReadDelta = 1; inputPointerReadDelta = 1;
} }
return inputPointerReadDelta > slownessFactor * fastestLocalRead; return inputPointerReadDelta > slownessFactor * fastestLocalRead;