Degraded Network Performance When Using Sun Dual 10Gbe Pcie Ems (Cr 6943558); Unsupported Port Mode Messages Logged (Cr 6962912); Supported Modular Components" On - Sun Oracle Netra SPARC T3-1B Product Notes

Degraded Network Performance When Using Sun
Dual 10GbE PCIe EMs (CR 6943558)
Excessive packet loss can occur when two or more ports are used across multiple
Sun Dual 10GbE PCIe 2.0 PCIe EMs. As a result, transmit and receive performance is
significantly degraded.
Workaround: Enable flow control in the ixgbe driver by performing the following
procedure. This action greatly reduces packet loss and improves performance.
As superuser, add the following line in the /kernel/drv/ixgbe.conf file:
flow_control = 3;
Then reboot the server module.
unsupported port mode Messages Logged
(CR 6962912)
When a 10GbE XAUI Pass-Through FEM is used with an incompatible NEM (such as
a NEM and FEM combination not listed in
page
nxge: [ID 752849 kern.warning] WARNING: nxge1 :
nxge_n2_kt_serdes_init:port<0> - unsupported port mode 8
nxge: [ID 752849 kern.warning] WARNING: nxge1 :
nxge_n2_kt_serdes_init:port<1> - unsupported port mode 8
nxge: [ID 752849 kern.warning] WARNING: nxge1 :
nxge_n2_serdes_init: Failed to initialize N2 serdes for port<0>
nxge: [ID 752849 kern.warning] WARNING: nxge1 :
nxge_n2_serdes_init: Failed to initialize N2 serdes for port<1>
Workaround: Ensure that your server module is configured with the correct NEM
and FEM combination. These messages are not an indication of malfunctioning
hardware or software. You can ignore the messages.
14 Netra SPARC T3-1B Server Module Product Notes • September 2012
3), the following messages might be logged in the /var/adm/messages file:

"'Supported Modular Components" on