Virtualisation des E/S

• IO virtualization in s/w incurs overhead

• • Latency vs. overhead tradeoff
  • • More of an issue for network than storage
  • Can burn 10-30% more CPU

• Solution is well understood

• • Direct h/w access from VMs
  • • Multiplexing and protection implemented in h/w
  • Smart NICs / HCAs
  • • Infiniband, Level-5, Aaorhi etc
    • Will become commodity before too long