TCP Servers: Offloading TCP Processing in Internet Servers. Design, Implementation, and Performance
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1 TCP Servers: Offloading TCP Processing in Internet Servers. Design, Implementation, and Performance M. Rangarajan, A. Bohra, K. Banerjee, E.V. Carrera, R. Bianchini, L. Iftode, W. Zwaenepoel. Presented by: Thomas Repantis CS260-Seminar in Computer Science, Fall 2004 p.1/35
2 Overview To execute the TCP/IP processing on a dedicated processor, node, or device (the TCP server) using low-overhead, non-intrusive communication between it and the host(s) running the server application. Three TCP Server architectures: 1. A dedicated network processor on a symmetric multiprocessor (SMP) server. 2. A dedicated node on a cluster-based server built around a memory-mapped communication interconnect such as VIA. 3. An intelligent network interface in a cluster of intelligent devices with a switch-based I/O interconnect such as Infiniband. CS260-Seminar in Computer Science, Fall 2004 p.2/35
3 Introduction The network subsystem is nowadays one of the major performance bottlenecks in web servers: Every outgoing data byte has to go through the same processing path in the protocol stack down to the network device. Proposed solution a TCP Server architecture: Decoupling the TCP/IP protocol stack processing from the server host, and executing it on a dedicated processor/node. CS260-Seminar in Computer Science, Fall 2004 p.3/35
4 Introductory Details The communication between the server host and the TCP server can dramatically benefit from using low-overhead, non-intrusive, memory-mapped communication. The network programming interface provided to the server application must use and tolerate asynchronous socket communication to avoid data copying. CS260-Seminar in Computer Science, Fall 2004 p.4/35
5 Apache Execution Time Breakdown CS260-Seminar in Computer Science, Fall 2004 p.5/35
6 Motivation The web server spends in user space only 20% of its execution time. Network processing, which includes TCP send/receive, interrupt processing, bottom half processing, and IP send/receive take about 71% of the total execution time. Processor cycles devoted to TCP processing, cache and TLB pollution (OS intrusion on the application execution). CS260-Seminar in Computer Science, Fall 2004 p.6/35
7 TCP Server Architecture The application host avoids TCP processing by tunneling the socket I/O calls to the TCP server using fast communication channels. Shared memory and memory-mapped communication for tunneling. CS260-Seminar in Computer Science, Fall 2004 p.7/35
8 Advantages Kernel Bypassing. Asynchronous Socket Calls. No Interrupts. No Data Copying. Process Ahead. Direct Communication with File Server. CS260-Seminar in Computer Science, Fall 2004 p.8/35
9 Kernel Bypassing Bypassing the host OS kernel. Establishing a socket channel between the application and the TCP server for each open socket. The socket channel is created by the host OS kernel during the socket call. CS260-Seminar in Computer Science, Fall 2004 p.9/35
10 Asynchronous Socket Calls Maximum overlapping between the TCP processing of the socket call and the application execution. Avoid context switches whenever this is possible. CS260-Seminar in Computer Science, Fall 2004 p.10/35
11 No Interrupts Since the TCP server exclusively executes TCP processing, interrupts can be apparently easily and beneficially replaced with polling. Too high polling frequency rate would lead to bus congestion while too low would result in inability to handle all events. CS260-Seminar in Computer Science, Fall 2004 p.11/35
12 No Data Copying With asynchronous system calls, the TCP server can avoid the double copying performed in the traditional TCP kernel implementation of the send operation. The application must tolerate the wait for completion of the send. For retransmission, the TCP server can read the data again from the application send buffer. CS260-Seminar in Computer Science, Fall 2004 p.12/35
13 Process Ahead The TCP server can execute certain operations ahead of time, before they are actually requested by the host. Specifically, the accept and receive system calls. CS260-Seminar in Computer Science, Fall 2004 p.13/35
14 Direct Communication with File Server In a multi-tier architecture a TCP server can be instructed to perform direct communication with the file server. CS260-Seminar in Computer Science, Fall 2004 p.14/35
15 TCP Server in an SMP-based Architecture Dedicating a subset of the processors for in-kernel TCP processing. Network generated interrupts are routed to the dedicated processors. The communication between the application and the TCP server is through queues in shared CS260-Seminar in Computer Science, Fall 2004 p.15/35 memory.
16 SMP-based Architecture Details Offloading interrupts and receive processing. Offloading TCP send processing. CS260-Seminar in Computer Science, Fall 2004 p.16/35
17 TCP Server in a Cluster-based Architecture Dedicating a subset of nodes to TCP processing. VIA-based SAN interconnect. CS260-Seminar in Computer Science, Fall 2004 p.17/35
18 Cluster-based Architecture Operation The TCP server node acts as the network endpoint for the outside world. The network data is transferred between the host node and the TCP server node across SAN using low latency memorymapped communication. CS260-Seminar in Computer Science, Fall 2004 p.18/35
19 Cluster-based Architecture Details The socket call interface is implemented as a user level communication library. With this library a socket call is tunneled across SAN to the TCP server. Several implementations: 1. Split-TCP (synchronous) 2. AsyncSend 3. Eager Receive 4. Eager Accept 5. Setup With Accept CS260-Seminar in Computer Science, Fall 2004 p.19/35
20 TCP Server in an Intelligent-NIC-based Architecture Cluster of intelligent devices over a switched-based I/O (Infiniband). The devices are considered to be "intelligent", i.e., each device has a programmable processor and local memory. CS260-Seminar in Computer Science, Fall 2004 p.20/35
21 Intelligent-NIC-based Architecture Details Each open connection is associated with a memory-mapped channel between the host and the I-NIC. During a message send, the message is transferred directly from user-space to a send buffer at the interface. A message receive is first buffered at the network interface and then copied directly to user-space at the host. CS260-Seminar in Computer Science, Fall 2004 p.21/35
22 4-way SMP-based Evaluation Dedicating two processors to network processing is always better than dedicating only one. CS260-Seminar in Computer Science, Fall 2004 p.22/35 Throughput benefits of up to 25-30%.
23 4-way SMP-based Evaluation CS260-Seminar in Computer Science, Fall 2004 p.23/35
24 4-way SMP-based Evaluation When only one processor is dedicated to the network processing, the network processor becomes a bottleneck and, consequently, the application processor suffers from idle time. When we apply two processors to the handling of the network overhead, there is enough network processing capacity and the application processor becomes the bottleneck. The best system would be one in which the division of labor between the network and application processors is more flexible, allowing for some measure of load balancing. CS260-Seminar in Computer Science, Fall 2004 p.24/35
25 2-node Cluster-based Evaluation for Static Load Asynchronous send operations outperform their counterparts CS260-Seminar in Computer Science, Fall 2004 p.25/35
26 2-node Cluster-based Evaluation for Static Load Smaller gain than that achievable with SMP-based architecture. 17% is the greatest throughput improvement we can achieve with this architecture/workload combination. CS260-Seminar in Computer Science, Fall 2004 p.26/35
27 2-node Cluster-based Evaluation for Static Load In the case of Split-TCP and AsyncSend the host has idle time available since it is the network processing at the TCP server that proves to be the bottleneck. CS260-Seminar in Computer Science, Fall 2004 p.27/35
28 2-node Cluster-based Evaluation for Static and Dynamic Load Split TCP and Async Send systems saturate later than Regular TCP. CS260-Seminar in Computer Science, Fall 2004 p.28/35
29 2-node Cluster-based Evaluation for Static and Dynamic Load At an offered load of about 500 reqs/sec, the host CPU is effectively saturated. 18% is the greatest throughput improvement we can achieve with this architecture. CS260-Seminar in Computer Science, Fall 2004 p.29/35
30 2-node Cluster-based Evaluation for Static and Dynamic Load Balanced confgurations depend heavily on the particular characteristics of the workload. A dynamic load balancing scheme between host and TCP server nodes is required for ideal performance in dynamic workloads CS260-Seminar in Computer Science, Fall 2004 p.30/35
31 Intelligent-NIC-based Simulation Evaluation For all the simulated processor speeds, the Split-TCP system outperforms all the other implementations. The improvements over a conventional system range from 20% to 45%. CS260-Seminar in Computer Science, Fall 2004 p.31/35
32 Intelligent-NIC-based Simulation Evaluation The ratio of processing power at the host to that available at the NIC plays an important role in determining the server performance. In Split-TCP the processor on the NIC saturates much earlier than the host processor or the CS260-Seminar in Computer Science, Fall 2004 p.32/35
33 Conclusions about TCP Servers 1/2 Offloading TCP/IP processing is beneficial to overall system performance when the server is overloaded. An SMP-based approach to TCP servers is more efficient than a cluster-based one. The benefits of SMP and cluster-based TCP servers reach 30% in the scenarios we studied. The simulated results show greater gains of up to 45% for a cluster of devices. CS260-Seminar in Computer Science, Fall 2004 p.33/35
34 Conclusions about TCP Servers 2/2 TCP servers require substantial computing resources for complete offloading. The type of workload plays a significant role in the efficiency of TCP servers. Depending on the application workload, either the host processor or the TCP Server can be- come the bottleneck. Hence, a scheme to balance the load between the host and the TCP Server would be beneficial for server performance. CS260-Seminar in Computer Science, Fall 2004 p.34/35
35 Thank you! Questions/comments? CS260-Seminar in Computer Science, Fall 2004 p.35/35
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