Cisco 7008P - SFS InfiniBand Server Switch Manuel d'utilisateur Page 10

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© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID
10
Sources of overhead in Datacenter
Servers
CPU
NIC
System
Memory
TCP
Buffer
Pool
App
Buffer
TCP/IP
h/w
s/w
Kernel
User
40%Transport Processing
Application Context
Switches
Intermediate Buffer
Copying
Sources of Overhead in
Server Networking
40%
20%
CPU
Overhead
Solutions for Overhead in Server Networking
Transport Offload Engine (TOE)
Moves Transport processor cycles to the NIC
Moves TCP/IP protocol stack buffer copies
from system memory to the NIC memory
RDMA
Eliminates intermediate and application buffer copies
(memory bandwidth consumption)
Kernel Bypass – direct user-level access to hardware
Dramatically reduces application context switches
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