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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opensc-tool

OPENSC-TOOL(1)							   OpenSC Tools 						    OPENSC-TOOL(1)

NAME

       opensc-tool - generic smart card utility

SYNOPSIS

       opensc-tool [OPTIONS]

DESCRIPTION

       The opensc-tool utility can be used from the command line to perform miscellaneous smart card operations such as getting the card ATR or
       sending arbitrary APDU commands to a card.

OPTIONS

       --atr, -a
	   Print the Answer To Reset (ATR) of the card. Output is in hex byte format

       --card-driver driver, -c driver
	   Use the given card driver. The default is auto-detected.

       --info, -i
	   Print information about OpenSC, such as version and enabled components.

       --list-drivers, -D
	   List all installed card drivers.

       --list-files, -f
	   Recursively list all files stored on card.

       --list-readers, -l
	   List all configured readers.

       --name, -n
	   Print the name of the inserted card (driver).

       --reader num, -r num
	   Use the given reader number. The default is 0, the first reader in the system.

       --send-apdu apdu, -s apdu
	   Sends an arbitrary APDU to the card in the format AA:BB:CC:DD:EE:FF....

       --serial
	   Print the card serial number (normally the ICCSN). Output is in hex byte format

       --verbose, -v
	   Causes opensc-tool to be more verbose. Specify this flag several times to enable debug output in the opensc library.

       --wait, -w
	   Wait for a card to be inserted.

SEE ALSO

       opensc-explorer(1)

opensc								    06/17/2014							    OPENSC-TOOL(1)

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