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Full Discussion: Eth0 Limitations
Operating Systems Linux Red Hat Eth0 Limitations Post 302640881 by mark54g on Tuesday 15th of May 2012 03:22:57 PM
Old 05-15-2012
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.
 

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Graphics::Primitive::Insets(3pm)			User Contributed Perl Documentation			  Graphics::Primitive::Insets(3pm)

NAME
Graphics::Primitive::Insets - Space between things DESCRIPTION
Graphics::Primitive::Insets represents the amount of space that surrounds something. This object can be used to represent either padding or margins (in the CSS sense, one being inside the bounding box, the other being outside) SYNOPSIS
use Graphics::Primitive::Insets; my $insets = Graphics::Primitive::Insets->new({ top => 5, bottom => 5, left => 5, right => 5 }); METHODS
Constructor new Creates a new Graphics::Primitive::Insets. Instance Methods as_array Return these insets as an array in the form of top, right, bottom and left. bottom Set/Get the inset from the bottom. equal_to Determine if these Insets are equal to another. left Set/Get the inset from the left. right Set/Get the inset from the right. top Set/Get the inset from the top. zero Sets all the insets (top, left, bottom, right) to 0. AUTHOR
Cory Watson, "<gphat@cpan.org>" SEE ALSO
perl(1) COPYRIGHT &; LICENSE Copyright 2008-2010 by Cory G Watson. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.12.3 2010-08-21 Graphics::Primitive::Insets(3pm)
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