Eth0 Limitations Post: 302640881

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Operating Systems Linux Red Hat Eth0 Limitations Post 302640881 by mark54g on Tuesday 15th of May 2012 03:22:57 PM

05-15-2012

Registered User

Duffs,

You are confused. One, we'd need to know what card it is and the driver in order to tell you what "limitations" it has.

What are the problems you have had with performance? Do you realize that even a 1Gbit card is really only running around 100 Megabytes per second, assuming your switch can even handle that?

Are you configuring the switch and card as full duplex or as auto detect? Most Gigabit and faster connections recommend auto detection for optimal performance.

Without knowing what your issue is, we cannot help you. Does the app send lots of small packets or fewer large ones? Do you do interrupt coalescence? Are you using Nagle's algorithm?

Have you tuned your kernel parameters?

The metrics you have shown have only told us how many packets have hit the wire, and no time frame, or anything.

Let me ask you. How many gallons should it take for me to get to work by driving?

I have not told you how far it is, how fast I drive, what car it is, how well tuned it is, etc, or the inflation of my tires.

---------- Post updated at 03:22 PM ---------- Previous update was at 11:37 AM ----------

Quote:

Originally Posted by methyl

I think you need to post the difference between two samples over a given reasonable period of time.

Depending on what network kit this server is plugged into, auto-negotiation should be avoided. It usually needs turning off on the server and the LAN port. Similarly anywhere where network components are cascaded.
It looks like auto-negotiation is off on your server.

For gigabit, auto-neg is almost always recommended. Performance deteriorates when they try to force.

mark54g

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tc574_cs

3C574_CS(4)						     Kernel Interfaces Manual						       3C574_CS(4)

NAME

       3c574_cs - 3Com 3c574 Etherlink XL 10/100 PC Card device driver

SYNOPSIS

       insmod 3c574_cs.o [pc_debug=n] [if_port=n] [irq_list=i,j,...]  [full_duplex=n] [auto_polarity=n] [max_interrupt_work=n]

DESCRIPTION

       3c574_cs  is the low-level Card Services driver for the 3Com 3c574 EtherLink XL PCMCIA ethernet adapter.  When this driver is attached 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).

       The  driver uses the N-Way autonegotiating transceiver to negotiate the speed and duplex of the network link.  If the link partner does not
       support negotiation, only the link speed is detected.

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.

       if_port=n
	      Selects  the  transceiver type.  Only 0, 1, and 4 are acceptable values, other values return an error.  This actual value specificed
	      is ignored -- the autonegotiating transceiver selects the media speed and duplex used.

       irq_list=i,j,...
	      This option limits the set of interrupts that may be allocated by this driver.  The default is all normally-usable IRQs.

       full_duplex=n
	      This flag determines if only full-duplex modes are advertised.  It defaults to 0 (false).

       This flag can be used to control the transceiver's auto polarity
	      detection capability.  Some Cisco Catalyst switches are known to interact badly with this feature in 10baseT mode.  It defaults to 1
	      (enabled).

       max_interrupt_work=work-limit
	      This  option  selects the maximum amount of work handled during each interrupt.  Each received packet counts as one unit of work, as
	      does updating statistics counters and handling errors.  The default is 32.

DIAGNOSTICS

       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.

AUTHOR

       Driver core: Donald Becker - becker@scyld.com

       PC Card interface: David Hinds - dahinds@users.sourceforge.net

SEE ALSO

       cardmgr(8), pcmcia(5), ifport(8).

pcmcia-cs							       $Date							       3C574_CS(4)

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