关于虚拟磁盘的问题
请教个关于虚拟磁盘的问题，如果要划分1G或更大的内存出来给这个虚拟磁盘使用，在内核里面如何做到呢？微软自带的那个Ramdisk程序是用ExAllocatePoolWithTag来分配非分页内存的，这个函数分配的内存是有限制的，不能分配大的内存，如何分配到我当前机器的所有的剩余内存？
谢谢先。
[解决办法]
弄个链表，即使是每次只分配1M，1024个不就1G了么。。。有其实位置有偏移，应该能实现1G的虚拟磁盘吧
[解决办法]
PagedPoolSize and NonPagedPoolSize Values in Windows NT
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The information in this article applies to:
Microsoft Windows NT Workstation versions 3.5, 3.51, 4.0
Microsoft Windows NT Server versions 3.5, 3.51, 4.0
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SUMMARY
Windows NT calculates NonPagedPoolSize and PagedPoolSize based on the amount of physical memory present in the computer at boot time. This article describes the algorithms used to calculate these values on an x86- based computer.
NOTE: The Windows NT 3.5 Resource kit incorrectly describes PagedPoolSize calculations.
MORE INFORMATION
NonPagedPoolSize and PagedPoolSize are calculated using complex algorithms based on physical memory size. However, you can use the following formulas to approximate these values for an X86-based computer.
Definitions
MinimumNonPagedPoolSize = 256K
MinAdditionNonPagedPoolPerMb = 32K
DefaultMaximumNonPagedPool = 1 MB
MaxAdditionNonPagedPoolPerMb = 400K
PTE_PER_PAGE = 1024
PAGE_SIZE=4096
NonPagedPoolSize Calculation
NonPagedPoolSize = MinimumNonPagedPoolSize + ((Physical MB - 4) * MinAdditionNonPagedPoolPerMB)
EXAMPLE - On a 32 MB x86-based computer:
MinimumNonPagedPoolSize = 256K
NonPagedPoolSize = 256K + ((32 - 4) * 32K) = 1.2 MB
MaximumNonPagedPoolSize = DefaultMaximumNonPagedPool + ((Physical MB - 4) * MaxAdditionNonPagedPoolPerMB)
If MaximumNonPagedPoolSize < (NonPagedPoolSize + PAGE_SIZE * 16),
then MaximumNonPagedPoolSize = (NonPagedPoolSize + PAGE_SIZE * 16)
IF MaximumNonPagedPoolSize >= 128 MB MaximumNonPagedPoolSize = 128 MB
EXAMPLE - On a 32 MB x86-based computer:
MaximumNonPagedPoolSize = 1 MB + ((32 - 4) * 400K) = 12.5 MB
PagedPoolSize Calculation
Size = (2 * MaximumNonPagedPoolSize) / PAGESIZE Size = (Size + (PTE_PER_PAGE - 1)) / PTE_PER_PAGE PagedPoolSize = Size * PAGESIZE * PTE_PER_PAGE IF PagedPoolSize >= 192 MB PagePoolSize = 192 MB EXAMPLE - On a 32 MB x86-based computer:
Size = (2 * 12.5M) / 4096 = 6400
Size = (6400 + (1024 - 1)) / 1024 = 7.25
PagedPoolSize = 7.25 * 4096 * 1024 = 30MB
NOTE: If both values are set to zero in the registry, PagedPoolSize will calculate to approximately memory size)
The kernel debugger can be used to view these global variables in memory.
The values shown below are for a 32 MB x86-based computer running Windows NT 3.5, build 807:
kd> dd MmDefaultMaximumNonPagedPool
8019e4d4 00100000 (1Mbyte)
kd> dd MmSizeOfNonPagedPoolInBytes
80196188 00120000 (1,179,648)
kd> dd MmMinimumNonPagedPoolSize l1
8019e4cc 00040000 (262144)
kd> dd MmNumberOfPhysicalPages l1
801961ac 00002010 (8208)
kd> dd MmMinAdditionNonPagedPoolPerMb l1
8019e4d0 00008000 (32768)
kd> dd MmMaximumNonPagedPoolInBytes l1
80196310 00c20000 (12713984)
kd> dd MmSizeOfPagedPoolInBytes l1
8019e4dc 02000000 (33554432)
These values may be modified in the registry.
WARNING: Using the Registry Editor incorrectly can cause serious, system- wide problems that may require you to reinstall Windows NT to correct them. Microsoft cannot guarantee that any problems resulting from the use of the Registry Editor can be solved. Use this tool at your own risk.
The page pooled memory management parameters are located in:
HKEY_LOCAL_MACHINE
\\SYSTEM
\\CurrentControlSet
\\Control
\\Session Managerl
\\Memory Management
For additional information about the /3GB setting, click the article number below to view the article in the Microsoft Knowledge Base:
Q171793 Information on Application Use of 4GT RAM Tuning
Microsoft Windows 2000
The Windows 2000 memory model increases the amount of nonpaged pool and paged pool memory available to the system.
A Windows 2000-based 32-bit x86 computer that is booted without the /3GB switch is changed to a maximum paged pool of approximately 300-470 MB (from 192 MB in Windows NT 4.0).
With Windows 2000, the amount of nonpaged pool that the operating system can use is increased to 256 MB (from 128 MB in Windows NT 4.0).
If the server is booted with the /3GB switch enabled, the memory model remains that same for nonpaged and paged pool as in Windows NT 4.0.
Additional query words: server storage poolcalc pool non-paged
Keywords : kbnetwork ntnetserv NTSrvWkst
Version : winnt:3.5,3.51,4.0
Platform : winnt
Issue type:
