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Processor cache: Dunnington
The Intel Xeon 7400 series processors (Dunnington) have three levels of cache
on the processor die:
L1 cache
L2 cache
L3 cache
3.1.2 Installation of processor options
The processors are accessible from the top of the server after opening the media
hood, as shown in Figure 3-2 on page 94. The media hood is hinged at the
middle of the system and contains the SAS drives, optical media and the light
path diagnostics panel.
The L1 execution, 32 KB instruction and 32 KB data, for data trace
cache in each core is used to store micro-operations, which are
decoded executable machine instructions. It serves those to the
processor at rated speed. This additional level of cache saves
decoding time on cache hits.
Each pair of cores in the processor has 3 MB of shared L2 cache,
for a total of 6 MB, or 9 MB of L2 cache. The L2 cache implements
the Advanced Transfer Cache technology.
Dunnington processors have 12 MB (4-core), or 16 MB (6-core)
shared L3 cache.
Chapter 3. Hardware configuration
93
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