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3: Compute Module
Primary and Secondary Cache
To reduce memory latency, a processor has access to two on-chip 32-KB L1 (primary)
caches (one cache is for data and the other cache is for instructions) and an off-chip L2
(secondary) cache. The L1 caches are located within the processor for fast, low-latency
access of instructions and data. The compute module supports a 4-MB L2 cache.
Note:
The IP53 node boards use SECDED ECC to protect data when transferred to and
from secondary cache, main memory, and directory memory.
The IP53 node boards use parity to protect data when transferred between a processor
and primary cache, and to protect system commands sent between the Bedrock ASIC and
a processor.
Local Memory (DIMMs)
Each compute module has from 1 to 8 GB of local memory, which includes main memory
and directory memory for cache coherence.
Local memory is provided by DIMMs, which contain double data rate synchronous
dynamic random-access memory (DDR SDRAM chips), installed in two or more DIMM
slots located on the compute module.
These eight DIMM slots are laid out into one group of even-numbered slots 0, 2, 4, and
6, and a second group of odd-numbered slots 1, 3, 5, and 7, as shown in Figure 3-4.
DIMMs are installed or removed one per DIMM slot, and two at a time, so that the two
DIMMs installed provide local memory, or remove local memory, for the same pair of
banks. For example, you could install a DIMM in slot 0 and another in slot 1 to provide
local memory for banks 0 and 1. And conversely, you could remove a DIMM from slot 0
and another from slot 1 in order to remove local memory from banks 0 and 1.
Note:
The two DIMMs that compose a bank pair must be the same size; however, the
bank pairs can differ in memory size.
Содержание Origin 350
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Страница 3: ...007 4566 001 iii Record of Revision Version Description 001 June 2003 Original publication ...
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Страница 93: ...Physical Features 007 4566 001 67 Figure 2 1 Example of SGI Origin 350 Server Systems 17U rack 39U rack ...
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Страница 211: ...Power Supplies 007 4566 001 185 Figure 6 23 Installing the power supply Bezel door Screen cover Ribbon cable D C A B ...
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