Service Guide

BIOS Setup Utilities
124 Intel
®
Server System P4000IP and Intel
®
Workstation System P4000CR Service Guide
Option Values:
Enabled
Disabled
Help Text:
The next cache line will be prefetched into L1 data cache from L2 or system
memory during unused cycles if it sees that the processor core has accessed
several bytes sequentially in a cache line as data.
[Disabled] – Only fetches cache line with data required by the processor (64 bytes).
Comments: DCU Data Prefetcher is normally
Enabled
, for best efficiency in L1
Data Cache and Memory Channel use, but disabling it may improve performance for some
processing loads and on certain benchmarks.
30. DCU Instruction Prefetcher
Option Values:
Enabled
Disabled
Help Text:
The next cache line will be prefetched into L1 instruction cache from L2 or system
memory during unused cycles if it sees that the processor core has accessed
several bytes sequentially in a cache line as data.
Comments: DCU Data Prefetcher is normally
Enabled
, for best efficiency in L1 I
Cache and Memory Channel use, but disabling it may improve performance for some
processing loads and on certain benchmarks.
31. Direct Cache Access (DCA)
Option Values:
Enabled
Disabled
Help Text:
Allows processors to increase the I/O performance by placing data from I/O devices
directly into the processor cache.
Comments: System performance is usually best with Direct Cache Access Enabled. In certain
unusual cases, disabling this may give improved results.
32. SMM Wait Timeout