Compaq 108164-003 - ProLiant - 800 White Paper page 15

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(cont.)
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In this data there is not the huge jump in Score as exhibited by the Pentium/100. This is
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possibly because the L2 cache is not being overrun at these user loads.
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This example shows how there is little benefit in adding a CPU when the system is not
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processor constrained. In the case of going from 1P to 2P the response time improves very
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little until the number of users exceeds 1000. Interestingly, there is no real apparent
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bottleneck in the server hardware itself. The gradual slowdown could be due to the Exchange
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software itself.
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For systems on which the workload is light (refer to Table 1 for workload comparisons), there
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is a tradeoff in adding CPUs to the processor subsystem due to system overhead. System
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requests and context switches increase substantially as more CPUs are added. This could also
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account for the marginal benefit in adding a second CPU, i.e. in this case the benefit could be
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offset by the additional overhead.
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This data implies that the system would be able to handle other tasks besides the email and
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public folder tasks in the LoadSim user profile. For example, the second CPU would likely be
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used more effectively if a gateway or some other Exchange process is added to the system.
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Four CPU data is omitted because it provides no additional benefit in this scenario.
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Pentium Pro/166
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P P /166 E
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ENTIUM RO
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Machine Class Compaq ProLiant 5000
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Processor Subsystem One Pentium Pro/166,
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512 Kbyte L2 cache
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System Memory 128 Mbytes
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Disk Subsystem Integrated Fast Wide SCSI-2 controller
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PCI SMART-2 Controller
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Network Interface Compaq NetFlex/3 PCI (10BaseT)
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Operating System Windows NT Server v3.51 + SP4
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Table 7. Pentium Pro /166 Exchange Server hardware configuration
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15
S
XCHANGE ERVER HARDWARE CONFIGURATION
Pagefile and executables volume : 1x2GB Fast Wide
SCSI-2 drive
Log volume : 2x2GB Fast SCSI-2 drives on port 0, RAID 1
(Array Accelerator enabled)
IS volume: 7x2GB Fast SCSI-2 drives on port 1, RAID 5
(Array Accelerator enabled)