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Full Discussion: Duplicating ethernet speed
Operating Systems Linux Red Hat Duplicating ethernet speed Post 302364635 by mark54g on Friday 23rd of October 2009 02:48:17 PM
Old 10-23-2009
Here's the issues you will face:

They are Gigabits, not Gigabytes (Gb vs GB). That is an 8x difference.

Also. Even with good Cat5e or Cat6 cable, you will not get a full gigabit of throughput. If you want more, go with specialized 10Gbe network adapters and switches or move to fiber.

Secondly, if you want to double speed, you need to bond/etherchannel the NICs. Google for this, as it will make more sense than I can in a scope I am not as intimately familiar with as you may find elsewhere.

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PCNET_CS(4)						     Kernel Interfaces Manual						       PCNET_CS(4)

pcnet_cs - generic NS8390-based PCMCIA Ethernet Driver SYNOPSIS
insmod pcnet_cs.o [pc_debug=n] [irq_list=i,j,...] [if_port=n] [full_duplex=n] [use_big_buf=n] [use_shmem=n] [mem_speed=n] [delay_output=n] [delay_time=n] [hw_addr=n,n,n,n,n,n] DESCRIPTION
Pcnet_cs is a driver for all NS8390-based PCMCIA ethernet cards. It can use either polled IO or a shared memory window to exchange data with the card. The driver first tests for a shared memory buffer, falling back on polled IO if the memory test fails. When this driver is bound to a card, it allocates the next available ethernet device (eth0..eth#). This device name will be reported in the kernel log file, and passed on to cardmgr(8). PARAMETERS
pc_debug=n Selects the PCMCIA debugging level. This parameter is only available if the module is compiled with debugging enabled. A non-zero value enables debugging. irq_list=i,j,... Specifies the set of interrupts that may be allocated by this driver. if_port=n Selects the transceiver type, for Socket EA and IBM CCAE cards. 1 is 10baseT (twisted pair), and 2 is 10base2 (BNC, or thin net). The default is 1 (10baseT). full_duplex=n For DL10022 based cards where pcnet_cs can't find the MII interface, this option permits manual control of the duplex setting. 1 is full duplex, and 0 is half duplex; the default is 0. use_big_buf=n For Socket EA cards, a flag indicating if the driver should use the large (64K) packet buffer. The default is 1 (true). use_shmem=n Selects shared memory versus polled IO mode for packet transfers. The default is -1, meaning to use the card's CIS information to decide. mem_speed=n Sets the access speed of the shared memory window, in nanoseconds. The default is 0 (i.e., no extra wait states). Values of up to 1000 are legal. delay_output=n Specifies that a delay should be inserted after a polled IO block output. This is turned on by default for Accton and Socket EA cards. delay_time=n Specifies the length of the delay_output delay, in microseconds. The default is 4. hw_addr=n,n,n,n,n,n For cards whose hardware ethernet addresses can't be identified by the current driver, this is a hack for hardwiring a specific address. The argument should consist of exactly six byte-sized numbers, separated by commas, with no spaces. Numbers may be in decimal or hex ('0xNN'). DIAGNOSTICS
pcnet_cs: this is an AX88190 card! Indicates that this card is based on the Asix AX88190 chipset, which requires the axnet_cs driver. eth#: interrupt(s) dropped! Indicates that the driver did not receive an interrupt notification for some reason. The driver will poll the card (with a signifi- cant performance penalty) if the problem persists. The most likely cause is an interrupt conflict and/or host bridge configuration problem. eth#: MII is missing! Indicates that the driver expects this card to have a ``Media Independent Interface'' for link speed and duplex selection, but could not find it. AUTHOR
David Hinds - dahinds@users.sourceforge.net SEE ALSO
cardmgr(8), pcmcia(5). pcmcia-cs 2001/11/04 22:57:46 PCNET_CS(4)

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