HP ProLiant xw2x220c Remote Graphics Software 5.2.5 User Guide - Page 146
Image update request #1
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The sequence chart in Figure 8-6 shows operation for the default property value of 4. In this case, the Receiver can have up to 4 image update requests outstanding at any given time. When image update response #1 is received (meaning that there are now 3 outstanding image update requests), the Receiver can issue image update request #5 (again, up to a maximum of 4 outstanding image update requests at any given time). Figure 8-6 Sequence chart for the default property value of 4 Sender Receiver Image update request #1 Image update request #2 Image update request #3 Image update request #4 Image update response #1 Image update request #5 Image update response #2 Image update request #6 The sequence can vary considerably from that shown in Figure 8-6. For example, image update response #1 might be received prior to issuance of image update request #4. Also, TCP will temporarily block the Sender from sending further data if the Receiver network buffer becomes full. Nonetheless, the sequence shown in Figure 8-6 serves to parallelize local display updates that otherwise would occur serially. The default property value of 4 was determined empirically as a good compromise for both low and high-latency network environments. Larger numbers of outstanding requests may be beneficial in some cases depending on the number and types of updates occurring. In high-latency network environments, HP recommends that you characterize RGS performance for different values of the Rgreceiver.MaxImageUpdateRequests property. RGS properties 146