Showing papers by "Jose Renato Santos published in 2011"

Gatekeeper: supporting bandwidth guarantees for multi-tenant datacenter networks

Abstract: Cloud environments should provide network performance isolation for co-located untrusted tenants in a virtualized datacenter. We present key properties that a performance isolation solution should satisfy, and present our progress on Gatekeeper, a system designed to meet these requirements. Experiments on our Xen-based implementation of Gatekeeper in a datacenter cluster demonstrate effective and flexible control of ingress/egress link bandwidth for tenant virtual machines under both TCP and greedy unresponsive UDP traffic.

Virtual machine packet processing

Abstract: Packet processing for packets from a virtual machine includes receiving a packet from an external switch at a computer system hosting a plurality of virtual machines. If the received packet is a learning packet, storing a packet signature determined from the learning packet. For a packet to be transmitted from a virtual machine in the computer system, determining if the packet's signature matches the stored packet signature. If the packet's signature matches the stored packet signature, performing an action associated with the packet signature.

Remote memory for virtual machines

Abstract: Remote memory can be used for a number idle pages located on a virtual machine. A number of idle pages can be sent to the remote memory according to a placement policy, where the placement policy can include a number of weighting factors. A hypervisor on a computing device can record a local size and a remote page fault frequency of the number of virtual machines. The hypervisor can scan local memory to determine the number of idle pages and a number of idle virtual machines. The number of idle pages, including a page map and a remote address destination for each idle page, can be sent to the remote memory by the hypervisor. The number of virtual machines can be analyzed to determine a per-virtual machine local memory allocation.

Methods of and apparatus for managing non-congestion-controlled message traffic in a datacenter

Abstract: Managing non-congestion-controlled message traffic in a datacenter. Any non-congestion-controlled packets originating in a sending server and intended for a receiving server are encapsulated in the sending server and transmitted through a virtual circuit having a message transport protocol with rate control. The packets are decapsulated in the receiving server.

Disaggregated Memory Benefits for Server Consolidation

Abstract: Recent architecture research has introduced a new building block - a memory blade - which provides disaggregated memory capacity expansion and sharing for an ensemble of blade servers. In this paper, we examine the systems implications of this new architectural building block. We build a software-based prototype of memory disaggregation and examine how the additional level of indirection provided by the memory blade can provide significantly higher levels of consolidation. We specifically examine the use case of multiple large memory virtual machines (VMs) consolidated onto a single server. We explore content based sharing strategies to maximize the utilization of both local and remote memory. Using an in-memory database workload, our results show significantly higher levels of consolidation versus baseline servers (twice as many VMs than a memory-constrained baseline, providing 47% higher throughput), cost-effective memory expansion (28% better performance-per-dollar versus a large memory baseline), and effective content based sharing (up to 40%).