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...curs when my GPLPV drivers give Windows a packet with the NdisPacketTcpChecksumSucceeded flag set. The problem is that the machine locks hard. After some tedious work with the debugger, I have found that Windows makes a call to a routine called RtlPrefetchMemoryNonTemporal, which looks like this: 8088e579 mov eax,dword ptr [nt!KePrefetchNTAGranularity 8088e57e 0f184100 prefetchnta [ecx] 8088e582 add ecx,eax 8088e584 sub edx,eax 8088e586 ja nt!RtlPrefetchMemoryNonTemporal+0x6 (8088e57e) 8088e588 ret Unfortunately it appears that the value at nt!KePrefetchNTAGranularity is 0, hence t...