[Quote=引用 17 楼 hustlaofan 的回复:]
我的32位xp,2G内存,结果为1912(M),系统不要内存了?
[/Quote]
申请到的是虚存,不是物理内存
windows 32位操作系统物理内存最大支持3G
内部内存管理中,虚似内存可达4G
内存管理全表
Memory type Limit in on X86 Limit in 64-bit Windows
User-mode virtual address space for each 32-bit process 2 GB
Up to 3 GB with IMAGE_FILE_LARGE_ADDRESS_AWARE and 4GT 2 GB with IMAGE_FILE_LARGE_ADDRESS_AWARE cleared (default)
4 GB with IMAGE_FILE_LARGE_ADDRESS_AWARE set
User-mode virtual address space for each 64-bit process Not applicable With IMAGE_FILE_LARGE_ADDRESS_AWARE set (default):
x64: 8 TB
Intel IPF: 7 TB
2 GB with IMAGE_FILE_LARGE_ADDRESS_AWARE cleared
Kernel-mode virtual address space 2 GB
From 1 GB to a maximum of 2 GB with 4GT 8 TB
Paged pool Limited by available kernel-mode virtual address space or the PagedPoolLimit registry key value.
Windows Vista and above: Limited only by kernel mode virtual address space. Starting with Windows Vista with Service Pack 1 (SP1), the paged pool can also be limited by the PagedPoolLimit registry key value.
Windows Home Server and Windows Server 2003: 530 MB
Windows XP: 490 MB
Windows 2000: 350 MB 128 GB
Windows Server 2003 and Windows XP: Up to 128 GB depending on configuration and RAM.
Windows 2000: Not applicable
Nonpaged pool Limited by available kernel-mode virtual address space, the NonPagedPoolLimit registry key value, or physical memory.
Windows Vista: Limited only by kernel mode virtual address space and physical memory. Starting with Windows Vista with SP1, the nonpaged pool can also be limited by the NonPagedPoolLimit registry key value.
Windows Home Server, Windows Server 2003, and Windows XP/2000: 256 MB, or 128 MB with 4GT. 75% of RAM up to a maximum of 128 GB
Windows Vista: 40% of RAM up to a maximum of 128 GB.
Windows Server 2003 and Windows XP: Up to 128 GB depending on configuration and RAM.
Windows 2000: Not applicable
System cache virtual address space (physical size limited only by physical memory) Limited by available kernel-mode virtual address space or the SystemCacheLimit registry key value.
Windows Vista: Limited only by kernel mode virtual address space. Starting with Windows Vista with SP1, system cache virtual address space can also be limited by the SystemCacheLimit registry key value.
Windows Home Server, Windows Server 2003, and Windows XP/2000: 860 MB with LargeSystemCache registry key set and without 4GT; up to 448 MB with 4GT. Always 1 TB regardless of physical RAM
Windows Server 2003 and Windows XP: Up to 1 TB depending on configuration and RAM.
Windows 2000: Not applicable
Physical Memory Limits: Windows 7
The following table specifies the limits on physical memory for Windows 7.
Version Limit on X86 Limit on X64
Windows 7 Ultimate 4 GB 192 GB
Windows 7 Enterprise 4 GB 192 GB
Windows 7 Professional 4 GB 192 GB
Windows 7 Home Premium 4 GB 16 GB
Windows 7 Home Basic 4 GB 8 GB
Windows 7 Starter 2 GB
Physical Memory Limits: Windows Server 2008 R2
The following table specifies the limits on physical memory for Windows Server 2008 R2. Windows Server 2008 R2 is available only in 64-bit editions.
Version Limit on X64 Limit on IA64
Windows Server 2008 R2 Datacenter 2 TB
Windows Server 2008 R2 Enterprise 2 TB
Windows Server 2008 R2 for Itanium-Based Systems 2 TB
Windows Server 2008 R2 Foundation 8 GB
Windows Server 2008 R2 Standard 32 GB
Windows HPC Server 2008 R2 128 GB
Windows Web Server 2008 R2 32 GB
Physical Memory Limits: Windows Server 2008
The following table specifies the limits on physical memory for Windows Server 2008. Limits greater than 4 GB for 32-bit Windows assume that PAE is enabled.
Version Limit on X86 Limit on X64 Limit on IA64
Windows Server 2008 Datacenter 64 GB 1 TB
Windows Server 2008 Enterprise 64 GB 1 TB
Windows Server 2008 HPC Edition 128 GB
Windows Server 2008 Standard 4 GB 32 GB
Windows Server 2008 for Itanium-Based Systems 2 TB
Windows Small Business Server 2008 4 GB 32 GB
Windows Web Server 2008 4 GB 32 GB
Physical Memory Limits: Windows Vista
The following table specifies the limits on physical memory for Windows Vista.
Version Limit on X86 Limit on X64
Windows Vista Ultimate 4 GB 128 GB
Windows Vista Enterprise 4 GB 128 GB
Windows Vista Business 4 GB 128 GB
Windows Vista Home Premium 4 GB 16 GB
Windows Vista Home Basic 4 GB 8 GB
Windows Vista Starter 1 GB
Physical Memory Limits: Windows Home Server
Windows Home Server is available only in a 32-bit edition. The physical memory limit is 4 GB.
Physical Memory Limits: Windows Server 2003 R2
The following table specifies the limits on physical memory for Windows Server 2003 R2. Limits over 4 GB for 32-bit Windows assume that PAE is enabled.
Version Limit on X86 Limit on X64
Windows Server 2003 R2 Datacenter Edition 64 GB
(16 GB with 4GT) 1 TB
Windows Server 2003 R2 Enterprise Edition 64 GB
(16 GB with 4GT) 1 TB
Windows Server 2003 R2 Standard Edition 4 GB 32 GB
Physical Memory Limits: Windows Server 2003 with Service Pack 2 (SP2)
The following table specifies the limits on physical memory for Windows Server 2003 with SP2. Limits over 4 GB for 32-bit Windows assume that PAE is enabled.
Version Limit on X86 Limit on X64 Limit on IA64
Windows Server 2003 with Service Pack 2 (SP2), Datacenter Edition 64 GB
(16 GB with 4GT) 1 TB 2 TB
Windows Server 2003 with Service Pack 2 (SP2), Enterprise Edition 64 GB 1 TB 2 TB
Windows Server 2003 with Service Pack 2 (SP2), Standard Edition 4 GB 32 GB
Physical Memory Limits: Windows Server 2003 with Service Pack 1 (SP1)
The following table specifies the limits on physical memory for Windows Server 2003 with SP1. Limits over 4 GB for 32-bit Windows assume that PAE is enabled.
Version Limit on X86 Limit on X64 Limit on IA64
Windows Server 2003 with Service Pack 1 (SP1), Datacenter Edition 64 GB
(16 GB with 4GT) X64 1 TB 1 TB
Windows Server 2003 with Service Pack 1 (SP1), Enterprise Edition 64 GB
(16 GB with 4GT) X64 1 TB 1 TB
Windows Server 2003 with Service Pack 1 (SP1), Standard Edition 4 GB 32 GB
Physical Memory Limits: Windows Server 2003
The following table specifies the limits on physical memory for Windows Server 2003. Limits over 4 GB for 32-bit Windows assume that PAE is enabled.
Version Limit on X86 Limit on IA64
Windows Server 2003, Datacenter Edition 64 GB
(16 GB with 4GT) 512 GB
Windows Server 2003, Enterprise Edition 64 GB
(16 GB with 4GT) 512 GB
Windows Server 2003, Standard Edition 4 GB
Windows Server 2003, Web Edition 2 GB
Windows Small Business Server 2003 4 GB
Windows Compute Cluster Server 2003 32 GB
Windows Storage Server 2003, Enterprise Edition 8 GB
Windows Storage Server 2003 4 GB
Physical Memory Limits: Windows XP
The following table specifies the limits on physical memory for Windows XP.
Version Limit on X86 Limit on X64 Limit on IA64
Windows XP 4 GB 128 GB 128 GB (not supported)
Windows XP Starter Edition 512 MB
Physical Memory Limits: Windows 2000
The following table specifies the limits on physical memory for Windows 2000.
Version Limit on X86
Windows 2000 Professional 4 GB
Windows 2000 Server 4 GB
Windows 2000 Advanced Server 8 GB
Windows 2000 Datacenter Server 32 GB