Figure 68: File Transfer Scenario: Ftp Session Begins; Figure 69: File Transfer Scenario: Speed Mismatch - Broadcom BCM5722 Programmer's Manual

Programmer's Guide
10/15/07
F T
ILE RANSFER
The client begins a FTP session (see
fer, even at gigabit wire speed.
S M
PEED ISMATCH
The Client sends pause frame(s) to the switch (see
almost exhausted. The Client begins sending pause frames, when the RX buffer high-water mark/threshold is hit. Any num-
ber 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.
Document 5722-PG101-R
Figure 68). The file size is very large and will take several minutes for a complete trans-
File
Gigabit Server

Figure 68: File Transfer Scenario: FTP Session Begins

Figure
Gigabit Server

Figure 69: File Transfer Scenario: Speed Mismatch

Bro adco m Co rp or atio n
File Transfer
Switch
Gigabit Client
69). The Client's pipe has been saturated, and the RX buffers are
Pause packets
Switch
Gigabit Client
BCM5722
Flow Control Scenario Page 514