Installation guide

Network Adapter Card Installation Guide - Book II
83
Warning
If you want to increase the size of the transmit and/or receive
descriptor rings, bear in mind that every descriptor needs about 2
KByte of memory for normal ethernet frames and about 10 KByte of
memory for jumbo frames. If you choose the maximum ring sizes for
transmit and receive descriptor rings and you have one dual link
adapter installed, you would need about 300 MByte of memory for
the descriptors (a dual link adapter has two transmit and two receive
descriptor rings, one for each port respectively) only.
So it is easily possible that you need too much system memory for
your installed adapter. Please check the amount of memory you
would need for your chosen ring sizes on all installed adapters and
compare this value with the memory size of your machine (you can
obtain this value with the command 'prtconf | more').
CopyThreshold_InstX
Type: integer
Default value: 1500
Valid range: 0 - 1500
During transmit, the driver needs the physical memory address of
frames to inform the hardware where to find the frame data. Setting the
DMA address on Solaris is rather slow, so in many cases it is faster to copy
the frame data to a buffer that has been set up in advance during driver
load. All frames with a length <= CopyThreshold are copied to such
buffers. For longer frames, the real DMA setup is executed. By default
(without Jumbo Frame support!), all frames are copied. You can
experiment with this parameter to find out if your system performs
better with only smaller frames copied.
Ignore_LenErr_InstX
Type: string
Default value: OFF
Valid values: OFF
ON