Essentials of Cloud Computing

266 Essentials of Cloud Computing

ofpseudocongestioneffect also remains open. Note that high latencies intro-

duced by hypervisor scheduling algorithm may also prevent ows from

meeting the specied deadlines.

10.5.10 PVTCP [7]

Paravirtualized TCP (PVTCP) proposes an efcient solution to the problem

of pseudocongestion effect. This approach does not require any changes to

be done in the hypervisor. Instead, the basic working of TCP is modied

to accept the latencies introduced by the hypervisor scheduler. An efcient

approach is suggested to capture the actual picture of every packet transmis-

sion involving the hypervisor-introduced latencies and then determine RTO

more accurately to lter out pseudocongestion effect.

Whenever the hypervisor ...