Sun Microsystems 10GBE XFP manual To Improve Performance on an AMD CPU Based Sun Platform

3.Add the following to a startup script, or use ndd before plumbing the interface:

#ndd -set /dev/ip ip_soft_rings_cnt 8

Utilizing more soft-rings provided by the Solaris TCP/IP stack significantly improves bulk throughput for Rx. The default number of soft-rings is 2, but changing it to 8 improves performance. (You can increase the number to 16 in UltraSparc-T1 based systems).

▼To Improve Performance on an AMD CPU Based Sun Platform

1.Enable soft-rings and change to a higher value than the default of 2 by adding the following to the /etc/system file:

set ip:ip_squeue_fanout=1 set ip_squeue_soft_ring=1

Bulk throughput for Rx can be significantly improved by utilizing more soft-rings provided by the Solaris TCP/IP stack. Soft-rings are disabled by default in previous and current releases of the Solaris-x86 Operating System.

2.Reboot the system:

#reboot -r

3.Set the MSI to 1 on AMD platforms by adding following to the /etc/system file:

set ddi_msix_alloc_limit=1

4.Reboot the system:

#reboot -r

44 Sun Dual 10GbE XFP PCI Express Card User’s Guide • January 2009