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Directory-based Cache Coherence:
Virtual networks
Three-lane protocols
Performance issues
SGI Origin 2000
Origin 2000 network
Origin 2000 I/O
Origin directory
Cache and dir. states
Handling a read miss
Serializing requests
Handling writebacks
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[From Chapter 8 of Culler, Singh, Gupta]
[SGI Origin 2000 material taken from Laudon and Lenoski, ISCA 1997]
[GS320 material taken from Gharachorloo et al., ASPLOS 2000]
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