机架级分解的漫长道路.pdf

1、The Long Road to Rackscale DisaggregationBob WheelerAnalyst-at-LargeOctober 18,20232QUARTERLY MARKET UPDATE|DECEMBER 18,2019OCP Summit 2023 Future Technologies Initiative In-Server Short-Reach Optical InterconnectsAbout Bob Wheeler Industry analyst for more than 20 yearsJoined The Linley Group in 20

2、01Principal Analyst as well as Publisher of Microprocessor ReportHeaded Comms Semi Market Share and Forecast Reports from 2013Left TechInsights in April 2022(following acquisition of The Linley Group)Marketing roles at AMD in mid-90s Engineering management roles at smaller OEMs Started career as a s

3、oftware engineer3QUARTERLY MARKET UPDATE|DECEMBER 18,2019OCP Summit 2023 Future Technologies Initiative In-Server Short-Reach Optical InterconnectsThe Holy Grail of Disaggregation Storage and networking disaggregation are well establishedVarious architectures deployed in hyperscale data centers Prog

4、ress toward main-memory disaggregation has been slowIntel promoted pooled-memory concepts a decade agoThe Gen-Z Consortium formed in 2016 backed by OEMs and memory vendors Compared with prior efforts,CXL is moving quickly to market4QUARTERLY MARKET UPDATE|DECEMBER 18,2019OCP Summit 2023 Future Techn

5、ologies Initiative In-Server Short-Reach Optical InterconnectsCXL Rides the Ubiquitous PCI Express Reusing the PCIe physical layer is key to adoptionEnables coherency without adding to processor pin countsAdd-in cards and modules use the same slots as PCIe devicesAdding CXL support to server require

6、s only the latest Epyc or Xeon CXL Type 3 devices provide cache-coherent memory expansion CXL.mem protocol uses fixed-length transactions Simplest topologies add 100ns of unloaded access latency5QUARTERLY MARKET UPDATE|DECEMBER 18,2019OCP Summit 2023 Future Technologies Initiative In-Server Short-Re