Intel Nehalem-EP处理器首发深度评测-服务器专区

Intel Nehalem-EP处理器首发深度评测

作者：IT168评测中心盘骏刘策编辑：盘骏 2009-03-31 00:00 来源：IT168�

　　为了体现出超线程对系统性能的影响，我们特地在另一台Nehalem-EP平台上作了打开/关闭超线程的测试。

SiSoftware Sandra Pro Business 2009
测试对象	Intel Nehalem-EP 双路Intel Gainestown Xeon X5570 2.93GHz	Intel Nehalem-EP 双路Intel Gainestown Xeon X5570 2.93GHz 无超线程
Processor Arithmetic Benchmark 处理器架构测试
Dhrystone ALU	142977MIPS	147034MIPS
Dhrystone ALU vs SPEED	48.75MIPS/MHz	50.13MIPS/MHz
Whetstone iSSE3	124035MFLOPS	80990MFLOPS
Dhrystone iSSE3 vs SPEED	42.29MFLOPS/MHz	27.61MFLOPS/MHz
Processor Multi-Media Benchmark 处理器多媒体测试
Multi-Media Int x16 iSSE4.1	296.85MPixel/s	260.47MPixel/s
Multi-Media Int x16 iSSE4.1 vs SPEED	101.21MPixel/s/MHz	88.81MPixel/s/MHz
Multi-Media Float x8 iSSE2	228.24MPixel/s	196.13MPixel/s
Multi-Media Float x8 iSSE2 vs SPEED	77.82kPixels/s/MHz	66.87kPixels/s/MHz
Multi-Media Double x4 iSSE2	125.88MPixel/s	102.33MPixel/s
Multi-Media Double x4 iSSE2 vs SPEED	42.92kPixels/s/MHz	34.89kPixels/s/MHz
Multi-Core Efficiency Benchmark
Inter-Core Bandwidth	75.61GB/s	32.66GB/s
Inter-Core Bandwidth vs SPEED	26.40MB/s/MHz	11.40MB/s/MHz
Inter-Core Latency (越小越好)	16ns	48ns
Inter-Core Latency vs SPEED (越小越好)	0.01ns/MHz	0.02ns/MHz
Memory Bandwidth Benchmark 内存带宽测试
Int Buff'd iSSE2 Memory Bandwidth	16.93GB/s	38.71GB/s
Float Buff'd iSSE2 Memory Bandwidth	16.90GB/s	38.52GB/s
Memory Latency Benchmark 内存延迟测试
Memory(Random Access) Latency (越小越好)	81ns	78ns
Speed Factor (越小越好)	61.40	61.60
Internal Data Cache	4clocks	4clocks
L2 On-board Cache	10clocks	9clocks
L3 On-board Cache	48clocks	46clocks
Cache and Memory Benchmark 缓存及内存测试
Cache/Memory Bandwidth	143.24GB/s	141.40GB/s
Cache/Memory Bandwidth vs SPEED	50.01MB/s/MHz	49.37MB/s/MHz
Speed Factor (越小越好)	20.90	21.90
Internal Data Cache	448.46GB/s	450.77GB/s
L2 On-board Cache	421.42GB/s	425.31GB/s
.NET Arithmetic Benchmark .NET架构测试
Dhrystone .NET	32904MIPS	31208MIPS
Dhrystone .NET vs SPEED	11.22MIPS/MHz	10.64MIPS/MHz
Whetstone .NET	78286MFLOPS	55638MFLOPS
Whetstone .NET vs SPEED	26.69MFLOPS/MHz	18.97MFLOPS/MHz
.NET Multi-Media Benchmark .NET多媒体测试
Multi-Media Int x1 .NET	62.28MPixel/s	55.60MPixel/s
Multi-Media Int x1 .NET vs SPEED	21.23kPixels/s/MHz	18.96kPixels/s/MHz
Multi-Media Float x1 .NET	26.19MPixel/s	15.95MPixel/s
Multi-Media Float x1 .NET vs SPEED	8.93kPixels/s/MHz	5.44kPixels/s/MHz
Multi-Media Double x1 .NET	51.45MPixel/s	29.85MPixel/s
Multi-Media Double x1 .NET vs SPEED	17.54kPixels/s/MHz	10.18kPixels/s/MHz

SiSoftware Sandra对比，用蓝色标出了性能特出的项目

　　关闭超线程之后，计算能力普遍下降，对L1/L2缓存的压力降低（因而L1/L2缓存带宽也就略为上升了），然而内存吞吐量也下降了，这表明每CPU三通道DDR3-1333对8个逻辑处理器是足够的。

　　只有极少数的项目中，关闭超线程获得了更好的测试成绩。Nehalem-EP的超线程比起Pentium 4时代有了不少的改进，你不应该将其关闭。

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