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– ioctl(fd,NIOCTXSYNC) queues the packets Transmit – fill up to avail buffers, starting from slot cur.Open("/dev/netmap") – ioctl(fd, NIOCREG, arg) – mmap(., fd, 0) maps buffers and rings OpenOnload Open Source OpenOnload availableĪs Open Source (GPLv2) – Please contact us if you’re interested Compatible with x86 (ia32, amd64/emt64) Currently supports SMC10GPCIe-XFP and SMC10GPCIe-10BT NICs – Could support other user-accessible network interfaces Very interested in user feedback – On the technology and project directions Slide 100.– 4 byte UDP payload (46 byte frame) Kernel Onload 1 sender 473,000 2,030,000 Slide 93 Performance: UDP transmit Nessage rate:.Ping-pong with 4 byte payload 70 byte frame: 14+20+20+12+4 ½ round-trip latency CPU overhead (microseconds) (microseconds) Hardware 4.2 - Kernel 11.2 7.0 Onload 5.3 1.1 Slide 89 Typical commodity server – Intel clovertown 2.3 GHz quad-core xeon (x1) 1.3 GHz FSB, 2 Gb RAM – Intel 5000X chipset – Solarflare Solarstorm SFC4000 (B) controller, CX4 – Back-to-back – RedHat Enterprise 5 (2.6.18-8.el5) Slide 88 Some performance results Test platform:.Anatomy of kernel-based networking Slide.Overheads take CPU time away from your application Latency – Holds your application up when it has nothing else to do – H/W + flight time + overhead Bandwidth – Dominates latency when messages are large – Limited by: algorithms, buffering and overhead Scalability – Determines how overhead grows as you add cores, memory, threads, sockets etc. Performance metrics Overhead – Networking.Is shared between the kernel and application contexts through a protected shared memory communications channel Kernel Application Application Context Context Context Application Application Application Protocol Protocol Enables correct handling of protocol state with high-performance Driver Network Driver DMA DMA Network Adaptor Slide 9 The OpenOnload architecture Protocol state.The OpenOnload architecture Protocol processingĬan take place both in the application and kernel context for a given flow Kernel Application Application Context Context Context Application Application Application Protocol Protocol Enables persistent / asynchronous processing Driver Network Driver Maintains existing network control-plane DMA DMA Network Adaptor Slide 8.Provides a user-safe interface which can route Ethernet packets to an application context based on flow information contained within headers Kernel Application Application Context Context Context Application Application Application Protocol Protocol Driver Network Driver DMA No new protocols DMA Network Adaptor Slide 7 The OpenOnload architecture Network hardware.Network Infrastructure Packet Size 1024 bytes Packet Size 64 bytes Packets/second 1.2 Million Packets/second 14.88 Million Arrival rate 67.2 ns Arrival rate 835 ns 2 GHz Clock 135 cycles cycles cycles 3 Ghz Clock 201 cycles cycles cycles 元 hit on Intel® Xeon® ~40 cycles 元 miss, memory read is (201 cycles at 3 GHz) Server vs Infrastructure Server Packets.The edge Stephen Hemminger Problem Statement 20,000,000 Packets per