https://git.reactos.org/?p=reactos.git&a=search&h=HEAD&st=grep&s=+MB+Memory
{quote}
reactos/ntoskrnl/ex/init.c
1592                                 "%u System Processor [%u MB Memory] %Z\r\n",
reactos/ntoskrnl/kd/kdio.c
 249         DPRINT1("%u System Processor [%u MB Memory]\n", KeNumberProcessors, MemSizeMBs);
 387         DPRINT1("%u System Processor [%u MB Memory]\n", KeNumberProcessors, MemSizeMBs);
 562         DPRINT1("%u System Processor [%u MB Memory]\n", KeNumberProcessors, MemSizeMBs);
reactos/ntoskrnl/kd64/kdinit.c
 381         DPRINT1("%u System Processor [%u MB Memory]\n", KeNumberProcessors, MemSizeMBs);
reactos/sdk/include/reactos/mc/bugcodes.mc
  38 %u System Processor [%u MB Memory] %Z\r
  62 %u System Processors [%u MB Memory] %Z\r
{quote}

https://git.reactos.org/?p=reactos.git;a=blob;f=reactos/ntoskrnl/kd/kdio.c;hb=bddf942900cbd56e825bcf85d6a772d2095d9635
{quote}
 211 KdpInitDebugLog(PKD_DISPATCH_TABLE DispatchTable,
...
 248         MemSizeMBs = MmNumberOfPhysicalPages * PAGE_SIZE / 1024 / 1024;
 249         DPRINT1("%u System Processor [%u MB Memory]\n", KeNumberProcessors, MemSizeMBs);

 357 KdpSerialInit(PKD_DISPATCH_TABLE DispatchTable,
...
 386         MemSizeMBs = KdpGetMemorySizeInMBs(KeLoaderBlock);
 387         DPRINT1("%u System Processor [%u MB Memory]\n", KeNumberProcessors, MemSizeMBs);

 521 KdpScreenInit(PKD_DISPATCH_TABLE DispatchTable,
...
 561         MemSizeMBs = MmNumberOfPhysicalPages * PAGE_SIZE / 1024 / 1024;
 562         DPRINT1("%u System Processor [%u MB Memory]\n", KeNumberProcessors, MemSizeMBs);
{quote}
--> Why isn't MemSizeMBs calculated identically at the 3 places?

https://git.reactos.org/?p=reactos.git&a=search&h=HEAD&st=grep&s=MmNumberOfPhysicalPages
{quote}
reactos/ntoskrnl/ex/init.c
1584     Size = MmNumberOfPhysicalPages * PAGE_SIZE / 1024 / 1024;
...
reactos/ntoskrnl/kd/kdio.c
 248         MemSizeMBs = MmNumberOfPhysicalPages * PAGE_SIZE / 1024 / 1024;
 561         MemSizeMBs = MmNumberOfPhysicalPages * PAGE_SIZE / 1024 / 1024;
...
{quote}

https://git.reactos.org/?p=reactos.git&a=search&h=HEAD&st=grep&s=KdpGetMemorySizeInMBs
{quote}
reactos/ntoskrnl/kd/kdio.c
  62 KdpGetMemorySizeInMBs(IN PLOADER_PARAMETER_BLOCK LoaderBlock)
 386         MemSizeMBs = KdpGetMemorySizeInMBs(KeLoaderBlock);
reactos/ntoskrnl/kd64/kdinit.c
  31 KdpGetMemorySizeInMBs(IN PLOADER_PARAMETER_BLOCK LoaderBlock)
 380         MemSizeMBs = KdpGetMemorySizeInMBs(KeLoaderBlock);
{quote}
--> (While there,) Why "same"(see above) code at a different place (io != init) between the 2 archs?

*****

https://git.reactos.org/?p=reactos.git&a=search&h=HEAD&st=grep&s=GetPhysicallyInstalledSystemMemory
{quote}
rostests/winetests/kernel32/heap.c
1149 static void test_GetPhysicallyInstalledSystemMemory(void)
...
1157     if (!pGetPhysicallyInstalledSystemMemory)
1159         win_skip("GetPhysicallyInstalledSystemMemory is not available\n");
...
{quote}

https://git.reactos.org/?p=reactos.git;a=blob;f=reactos/dll/win32/kernel32/client/heapmem.c;hb=16823de57bb18b9a7cee8f7b1440b66813b6a41c#l1272
{quote}
1272 GlobalMemoryStatusEx(LPMEMORYSTATUSEX lpBuffer)
{quote}