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Memory
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on May 9, 2007 at 3:59:34 pm
Kernel Comparison: Linux (2.6.21) versus Windows (Vista)
Memory
Memory Hardware Limits
Memory Limits (Hardware Support) | Linux | Windows | Maximum RAM - 32bit, no PAE (-,#112 #506) | <4GB40 | 1GB (Starter) <4GB40 (others) | Maximum RAM - 32bit, PAE (#111, #112 #506) | 64GB | 1GB (Starter) <4GB40 (others) | Maximum RAM - 64bit (-,#112) | 1024GB-8589934592GB | - (Starter) 8GB (Home Basic) 16GB (Home Premium) 128GB (others) |
Virtual Memory Limits
Virtual Memory (limits) | Linux | Windows | split user-mode/kernel-mode 32bit - default | static 3GB/1GB | dynamic 4GB/0GB-0GB/4GB | split user-mode/kernel-mode 32bit - static 1GB/3GB40 | Y | N | split user-mode/kernel-mode 32bit - static 2GB/2GB40 | Y | N | split user-mode/kernel-mode 32bit - static 3GB/1GB40 | Y | N | split user-mode/kernel-mode 32bit - dynamic 4GB/0GB-0GB/4GB | Y | Y | i.e. maximum memory per process 32bit, no PAE | 3GB (default) <4GB40 (dynamic 4GB/0GB-0GB/4GB) | <4GB40 2.5GB-3.5GB (typically) | maximum memory per process 32bit, PAE (#113, #114) | 64GB | <4GB40 2.5GB-3.5GB (typically) | split user-mode/kernel-mode 64bit (#301, #302) | 8388608 TB/8388608 TB | 8 TB/8 TB | i.e. maximum memory per process 64bit (#301, #302) | 8388608 TB | 8 TB |
Memory Hardware Features
Memory (Hardware Features) | Linux | Windows | Performance Acceleration Technology (PAT) | N | Y | MTRR | Y | Y | MTRR not needed (superseded by PAT) | N | Y | ECC | Y | Y |
Virtual Memory Sets
Virtual Memory (working sets) | Linux | Windows | working sets | global | per process | working set management uses "clock" algorithm | Y | Y | i.e. working set management - no set cap | Y | N | i.e. working set management - LRU memory page | used on the entire system | removed for that process | i.e. working set management - tuner adjusts sets according to memory needs | - | Y | swapper (#45, -) | N | N |
Virtual Memory Page Size
Virtual Memory (page size) | Linux | Windows | IA-32 page size - default (4KB arch) | 4KB | 4KB | IA-64 page size - default (4KB - 256MB arch) (compile time,?) | 8KB or 16KB | 8KB | IA-64 page size - range | 4KB - 256MB | ? |
Virtual Memory Priorities
Virtual Memory (priorities) | Linux | Windows | memory priorities | N Y (patch) | Y | priority levels | 0 | 8 "0-7" | priority level - default | - | "5" | priority level based on process/thread | N | Y |
Virtual Memory Features
Virtual Memory (features) | Linux | Windows | lock pages in memory | Y | Y | copy-on-write executables (COW) (#81, #82) | Y | Y | demand paging (#311, #312) | Y | Y |
Virtual Memory Multiprocessor
Virtual Memory (multiprocessor) | Linux | Windows | per-CPU kernel memory buffers | Y | Y | NUMA Memory Manager Support (#421, -) | Y | Y |
Swap
Virtual Memory Management (swap) | Linux | Windows | swap prefetch | N Y (with patch) | N Y (if preload app) | swap speculative | N Y (with patch) | N | swap performance - amount used | less15 | more15 |
Stack
Stack (kernel) | Linux | Windows | kernel stack size (#425, #426) | 8KB | 12KB |
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Johnathon Weare © Johnny Weare 2007
Widefox - the Vertical Tab Firefox
Memory
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