Intel E7-4860 AT80615007254AA 사용자 설명서
제품 코드
AT80615007254AA
Datasheet Volume 2 of 2
21
LLC Coherence Engine (Cbox) and Caching Agent (Sbox)
4
LLC Coherence Engine (Cbox)
and Caching Agent (Sbox)
The Intel Xeon Processor E7-8800/4800/2800 Product Families core to the last level
cache (LLC) interface is managed by the LLC coherence engine (Cbox). All Intel Xeon
Processor E7-8800/4800/2800 Product Families core to Intel
cache (LLC) interface is managed by the LLC coherence engine (Cbox). All Intel Xeon
Processor E7-8800/4800/2800 Product Families core to Intel
QuickPath Interconnect
messages are handled through the Cbox and system interface logic. The Intel Xeon
Processor E7-8800/4800/2800 Product Families contain ten instances of the Cbox, each
managing 3 MB of the 30 MB LLC. Five instances of the Cbox, C0-C4, are associated
with the Sbox 0, and C5-C9 are associated with Sbox 1.
Processor E7-8800/4800/2800 Product Families contain ten instances of the Cbox, each
managing 3 MB of the 30 MB LLC. Five instances of the Cbox, C0-C4, are associated
with the Sbox 0, and C5-C9 are associated with Sbox 1.
provides a Intel Xeon Processor E7-8800/4800/2800 Product Families block
diagram including Cbox and Sbox.
4.1
Last Level Cache
The 30 MB Last Level Cache (LLC) consists of ten 3 MB slices and are addressed via an
address hash function. This function is designed to evenly distribute accesses among
the cache slices, even if the access pattern is a regular stride. It is also designed to
evenly distribute accesses among the sets (indexes) of each slice.
address hash function. This function is designed to evenly distribute accesses among
the cache slices, even if the access pattern is a regular stride. It is also designed to
evenly distribute accesses among the sets (indexes) of each slice.
Figure 4-1. Intel Xeon Processor E7-8800/4800/2800 Product Families Block Diagram
Core
3
Core
2
Core
4
Core
5
Core
6
Core
7
Core
8
Core
9
Cbox
(LLC Coherence Engine)
Rbox
(Router)
30M Last Level Cache (L3 Cache)
Sbox
(Caching Agent 2)
Bbox
(Home
Agent 1)
Bbox
(Home
Agent 2)
Mbox
(Memory
Controller)
Mbox
(Memory
Controller)
Pbox
(Physical
Layer)
Pbox
(Physical
Layer)
Sbox
(Caching Agent 1)
Pbox
(Physical
Layer)
Pbox
(Physical
Layer)
Pbox
(Physical
Layer)
Pbox
(Physical
Layer)
4 Intel® QPI links
Dual Intel
®
SMI
Channels
Dual Intel
®
SMI
Channels
Wbox
(Power Controller)
Ubox
(System Config
Controller)
Core
10
Core
1