6–VMware Driver Software
Networking Support
52
83840-546-00 D
dropless_fc
The optional parameter
dropless_fc
can be used to enable a complementary flow
control mechanism on QLogic network adapters. The default flow control
mechanism is to send pause frames when the BRB is reaching a certain level of
occupancy. This is a performance targeted flow control mechanism. On QLogic
network adapters, you can enable another flow control mechanism to send pause
frames if one of the host buffers (when in RSS mode) is exhausted. This is a
zero
packet drop
targeted flow control mechanism.
Set the
dropless_fc
parameter to 1 as shown below to enable the dropless flow
control mechanism feature on all QLogic network adapters in the system.
vmkload_mod bnx2x dropless_fc=1
RSS
The optional parameter
RSS
can be used to specify the number of receive side
scaling queues. For VMware ESXi (5.1, 5.5, 6.0), values for
RSS
can be from 2 to
4;
RSS=1
disables RSS queues.
max_vfs
The optional parameter
max_vfs
can be used to enable a specific number of
virtual functions. Values for
max_vfs
can be 1 to 64, or set
max_vfs=0
(default) to
disable all virtual functions.
enable_vxlan_offld
The optional parameter
enable_vxlan_ofld
can be used to enable VMware ESXi
(5.5, 6.0) VxLAN task offloads with TX TSO and TX CSO. For VMware ESXi
(5.5, 6.0),
enable_vxlan_ofld=1
(default) enables VxLAN task offloads;
e
nable_vxlan_offload=0
disables VxLAN task offloads.
Driver Defaults
Speed
: Autonegotiation with all speeds advertised
Flow Control
: Autonegotiation with rx and tx advertised
MTU
: 1500 (range 46–9600)
Rx Ring Size
: 4078 (range 0–4078)
Tx Ring Size
: 4078 (range (MAX_SK4) - 4078). MAX_SKB_FRAGS
varies on different kernels and different architectures. On a 2.6 kernel for x86,
MAX_SKB_FRAGS is 18.
Coalesce RX Microseconds
: 25 (range 0–3000)
Coalesce TX Microseconds
: 50 (range 0–12288)
MSI-X
: Enabled (if supported by 2.6 kernel)
TSO
: Enabled
Summary of Contents for 8400 Series
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