User Manual

Rev 4.70
Mellanox Technologies
185
C.6 Ethernet Registry Keys
The following section describes the registry keys that are only relevant to Ethernet driver.
BlueFlame 1 The latency-critical Send WQEs to the device. When a
BlueFlame is used, the WQEs are written directly to the PCI
BAR of the device (in addition to memory), so that the
device may handle them without having to access memory,
thus shortening the execution latency. For best performance,
it is recommended to use the BlueFlame when the HCA is
lightly loaded. For high-bandwidth scenarios, it is recom-
mended to use regular posting (without BlueFlame).
The valid values are:
• 0: disable
• 1: enable
Note: This registry value is not exposed via the UI.
*MaxRSSProcessors 8 The maximum number of RSS processors.
Note: This registry key is only in Windows Server 2012 and
above.
Value Name Default Value Description
RoceMaxFrameSize 1024 The maximum size of a frame (or a packet) that can be sent by the
RoCE protocol (a.k.a Maximum Transmission Unit (MTU).
Using larger RoCE MTU will improve the performance; however,
one must ensure that the entire system, including switches, sup-
ports the defined MTU.
Ethernet packet uses the general MTU value, whereas the RoCE
packet uses the RoCE MTU
The valid values are:
• 256
• 512
• 1024
• 2048
Note: This registry key is supported only in Ethernet drivers.
*PriorityVLANTag 3 (Packet Pri-
ority & VLAN
Enabled)
Enables sending and receiving IEEE 802.3ac tagged frames, which
include:
• 802.1p QoS (Quality of Service) tags for priority-tagged pack-
ets.
• 802.1Q tags for VLANs.
When this feature is enabled, the Mellanox driver supports sending
and receiving a packet with VLAN and QoS tag.
Value Name Default Value Description