Jumbo Replenish Lwm Register (Offset 0X2D04) - Broadcom NetXtreme/NetLink BCM5718 Series Programmer's Manual

BCM5718 Programmer's Guide
Name
Replenish Low Water Mark

Jumbo Replenish LWM Register (offset 0x2D04)

Name
Legacy
Replenish Low Water Mark
Broadcom
®
January 29, 2016 • 5718-PG108-R
Default
Bits Access Value
7:0 RW 0x0
Default
Bits Access Value
31:8 RU 0x0
7:0 RW 0x0
Receive BD Initiator Control Registers
Description
This field must be programmed with the desired
LWM for Standard RBD cache/memory. The
value equally applies to all VRQs. Whenever the
number of BDs in a VRQ's BD memory falls
below this (LWM+1), a BD fetch is request
triggered.
Recommended Settings:
• Non-IOV mode:
STD LWM: 32. (1/4 of total RBDs)
• IOV mode:
STD LWM: 16. (1/2 of total RBDs)
Description
Unused
This field must be programmed with the desired
LWM for Jumbo RBD cache/memory. The value
equally applies to all VRQs. Whenever the
number of BDs in a VRQ's BD memory falls
below this (LWM+1), a BD fetch is request
triggered.
Recommended Settings:
• Non-IOV mode:
JMB LWM: 16. (1/4 of total RBDs)
• IOV mode:
JMB LWM: 4. (1/4 of total RBDs)
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