File Transfer; Speed Mismatch; Figure 56: File Transfer Scenario: Ftp Session Begins; Figure 57: File Transfer Scenario: Speed Mismatch - Broadcom NetXtreme/NetLink BCM5718 Series Programmer's Manual

BCM5718 Programmer's Guide
– Either half/full-duplex connection at Gigabit speed (i.e., this scenario will cover two subcases).

File Transfer

The client begins a FTP session (see
complete transfer, even at Gigabit wire speed.

Speed Mismatch

The Client sends pause frame(s) to the switch (see
RX buffers are almost exhausted. The Client begins sending pause frames, when the RX buffer high-water
mark/threshold is hit. Any number of reasons can account for the RX buffer issue. The assumption will be made
that the Client PCI bus lack bandwidth to DMA packets, at wire speed, to host memory. The user may be playing
a DVD, for example.
Broadcom
®
January 29, 2016 • 5718-PG108-R
Figure 56). The file size is very large and will take several minutes for a

Figure 56: File Transfer Scenario: FTP Session Begins

File
Gigabit Server

Figure 57: File Transfer Scenario: Speed Mismatch

Gigabit Server
File Transfer
Switch
Gigabit Client
Figure 57). The Client's pipe has been saturated, and the
Pause packets
Switch
Gigabit Client
Flow Control Scenario
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