Windows 10 32 pro pirated case
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If (status != STATUS_SUCCESS || resultSize != 4 || licenseValueType != 4)Ĭhar* bootProcStr = strstr(bootArgs, " BOOTPROC=") Ĭhar* bootProcVal = strstr(bootProcStr, "=") + 1 Ĭhar* numProcStr = strstr(bootArgs, " NUMPROC=") Ĭhar* numProcVal = strstr(numProcStr, "=") + 1 Ĭhar* hvNumProcStr = strstr(bootArgs, " HYPERVISORNUMPROC=") Ĭhar* hvNumProcVal = strstr(hvNumProcStr, "=") + 1 if getting the socket limit failed, default to 1 socket max &licenseValueType, /* value type (0=ANY, 4=DWORD) */ RtlInitUnicodeString(&krpName, L"Kernel-RegisteredProcessors") get the socket count limit from the license This happens around the same time that BCD OSLOADER variables are read. In the Phase1InitializationDiscard function, the maximum number of licensed sockets is read from the Kernel-RegisteredProcessors license value and written into the KeRegisteredProcessors exported variable. With that all out of the way, let’s dig in. Memory accesses across NUMA nodes require coordination between nodes, leading to increased latency. You usually have one NUMA node per CPU socket, but some AMD CPUs have multiple NUMA nodes per socket.
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My plan was to find out how the kernel keeps track of this count, then look for associated code that initialises the count during boot, and use that to find where the socket count limitation is applied. The first thing I did was throw the ntoskrnl.exe binary from my Windows 10 Pro for Workstations install into Ghidra, and started looking for query/helper functions that determine the number of CPUs or CPU sockets on the system. Of course “unsupported” just means “a challenge”, so I started looking into how I could get around the limit. So, according to these numbers, we could run Windows 10 on a four socket server, but we can’t run it on an eight socket server. Recreation of Wikipedia’s comparison table for Windows 10 Editions (foreshadowing: these numbers are inaccurate!)
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“Windows Desktop SKUs” means any desktop edition of Windows)īut where do these numbers come from? I could not find any official Microsoft documentation that details these limits.Īt time of writing, the Wikipedia article for Windows 10 editions lists the above socket count limits, plus core count limits, for each Windows 10 edition: Feature (quick terminology aside: a specific version and edition of Windows is usually referred to as a SKU, and it is common to refer to groups of related versions/editions of Windows as a set of SKUs, e.g. Windows 10 Pro for Workstations supports 4 sockets.Windows 10 Pro and Windows 10 Education support 2 sockets.
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Each edition of Windows 10 has an associated maximum number of allowed CPU sockets: Windows Desktop is much less restrictive. At time of writing a Windows Server 2019 Datacenter Additional 16 Core license costs in excess of 4000 GBP. It’s also worth noting that only physical cores count SMT cores (or “threads”) are not included in the licensing. This restriction means that you couldn’t, for example, run four quad-core CPUs on a base license – you’d need an additional 16-core license for that, to make up 8 licensed cores per socket. There’s one exception here: each CPU socket must be licensed for at least 8 cores. For example, on an 8-socket system filled with Xeon 8280 CPUs, you’ve got 8 * 28 = 224 physical cores, which would require the purchase of thirteen additional 16-core licenses. If you want to use more cores, you have to buy additional core licenses. Windows Server licenses come with a baseline limit of 16 physical processor cores. What led me to ask this question was curiosity: I wondered whether it would be possible to run Windows 10 on a Supermicro 7089P-TR4T – a single-node server with eight Intel Xeon Scalable sockets in an S8S configuration. How many processors does Windows 10 support? It’s a simple question, but the correct answer is surprisingly hard to come by.