sending pending syslog entries, etc., using a FIFO queue. A switch's IOS might only use software queuing for control plane functions, e.g. On switches, since so much queuing is directly tied to the hardware, software queuing is much more limited. On routers, besides FIFO, you have CQ, PQ, WFQ, CBWFQ, etc., for output software queues. Software queues, being managed by IOS, often can support much more complicated queuing. Since port buffer queues are designed for speed, they also tend to only support very simple queuing, such as FIFO. One common usage is to hold packets in a queue waiting for a port buffer to accept them. They are used to build some kind of ordered list of packets waiting for some processing. They would normally be stored in main RAM. Software queues are queues maintained by the IOS. Leveraging the very latest in web technology, the new interface is designed to be a multisystem management client, enabling the easy monitoring and management of many IBM i endpoint nodes from a single interface. This because actual RAM used for port buffers might be tied to a card and/or other special hardware support that allows port to push/pull bits very quickly. The IBM announcement included the following text: Navigator for i has been completely reimagined from the ground up. Port buffers are queues maintained by the interface port's software and are often very limited in size. An entry is sent to the queue every time a spooled file gets to RDY status on the output queue. You can attach a data queue to an output queue and have your CL program monitor for entries using the QRCVDTAQ API. If the output link had less bandwidth than the input link, back-to-back arrival of input packets will usually queue on the output side. Look at the Printer Device Programming Manual (SC41-5713-03) section 2.2.2.4.10 Data Queue Support on Output Queues. In this example, there wasn't any congestion. The output interface will transmit the packet and remove it from the output queue. Some logical process will examine the packet in the input queue, decide to discard it or forward it to an output queue. If you had a device with the same bandwidths in and out, the device will accept the packet on input interface and queue it. Activity Work with License Information Work with Output Queue Work. On the output side, it takes time to transmit the packet, so it's queued until tranmitted. IBM i 7.1 and 7.2 Technical Overview Mary Monine IBM Power i Technical Sales. Once it has been saved, something else must decide what to do with the received packet, generally either discard it or logically forward it. On the input side, usually there's little need to queue packets unless the device can't logically process them as quickly as they are received.Īt the interface level, hardware almost always is designed to accept a packet and save it. Performing analysis, modeling, detailed reports, and graphical views of IBM i servers provides insight to how servers are performing, and understanding how changes affect the ability to conduct daily business.Both are a place to store packets until something is done with the packet such that is no longer needs to be stored. To analyze your system performance, you can view job data, subsystem data, pool data, disk unit data, and much more. Detail views allow you to see detailed performance data for the selected time interval in a variety of ways. Performance Data Investigator (PDI) displays performance metrics graphically over a selected interval of time. The power of Performance Data Investigator provides you tools to summarize data into reports, create graphs to show trends, and dig deep into performance data to analyze the details of your system. The performance task available with IBM Navigator for i, allows you to manage and view Collection Services, Job Watcher, Disk Watcher, Batch Model, Performance Explorer, and Historical performance data unique to IBM i.
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