The network performance of linux

The network performance of linux

[Bergs]

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 I work on a linux 2.2.14 kernel to test the network
throughput of a linux  box used as a firewall.

 I find that when the IP packet length is 512B,the
throughput is the highest 71%. IP packet length is
smaller than 512B or bigger than 512B,the throughput
is the lower.

   I don't know why this ? Can I have some solutions
to improve the throughput of linux box ?


                              Bergs



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Re: The network performance of linux

[Mike Fedyk]

On Wed, Mar 20, 2002 at 09:12:19PM -0800, Bergs wrote:
> 
>  I work on a linux 2.2.14 kernel to test the network
> throughput of a linux  box used as a firewall.
> 
>  I find that when the IP packet length is 512B,the
> throughput is the highest 71%. IP packet length is
> smaller than 512B or bigger than 512B,the throughput
> is the lower.
> 
>    I don't know why this ? Can I have some solutions
> to improve the throughput of linux box ?
> 
> 

You'll need to post much more info about your hardware.

start with lspci and /proc/cpuinfo...

Also you didn't say how fast each packet size actually was, and did you use
a switch or what other type of network hardware.

Mike

Re: The network performance of linux

[David Schwartz]

On Wed, 20 Mar 2002 21:12:19 -0800 (PST), Bergs wrote:

>I work on a linux 2.2.14 kernel to test the network
>throughput of a linux  box used as a firewall.

>I find that when the IP packet length is 512B,the
>throughput is the highest 71%. IP packet length is
>smaller than 512B or bigger than 512B,the throughput
>is the lower.

>I don't know why this ? Can I have some solutions
>to improve the throughput of linux box ?

	I don't understand what you're measuring. Are you using TCP or UDP? If UDP, 
what exactly are you measuring? If TCP, how are you changing the packet size?

Re: The network performance of linux

[Mark]

Bergs wrote:

> I work on a linux 2.2.14 kernel to test the network
>throughput of a linux  box used as a firewall.
>
you need to provide more details:-

where are you measuring your poor performance? from a machine
behind your  firewall - or from the linux firewall itself?

how do you know the throughput is not being limited by the network?

mark