[LARTC] Packet mangling latency

[LARTC] Packet mangling latency

[Jamie Harris]

Firstly... sorry to those of you on both the netfilter and lartc list
who'll end up with this message twice...

I am trying to find out what kind of latency I can expect when dNAT'ing
UDP packets on (probably) a mid-range P3 server, 32-bit 33MHz PCI bus with
Intel EEPro NICs.  It'll most likely be running whatever the latest 2.4
kernel will be at the time, unless there are significant boosts in packet
mangling performace in 2.6.

Sorry that this is such vague set of specs, but this is just a vague idea
at the moment.  Any suggestions for hardware that would be particuarly
suited to shifting packets with the lowest possibly latency would be much
appreciated.

cheers.

Jamie...

PS Thanks to the Netfilter team for producing such a cracking frame work,
thanks to the LARTC guys for making me feel like a newbie again :)

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RE: [LARTC] Packet mangling latency

[Jamie Harris]

> The server should be fine. What network bandwidths are you looking into?

Nothing wild, ~10Mb tops

> The more the bandwidth, the higher the requirements. Also, ram is useful
> if you have a lot of smaller connections passing through the server at
> once.

Memory should be a problem from what I've been reading, but at todays
prices I can just fill the box to capacity.

> In my experience I have never felt latency on the line.

What kind of applications and at what bandwidth yourself?  Some of the
traffic will be going to/from game servers so latency can become
noticable.

cheers

Jamie...

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Re: [LARTC] Packet mangling latency

[Mike Miller]

> I am trying to find out what kind of latency I can expect when dNAT'ing
> UDP packets on (probably) a mid-range P3 server, 32-bit 33MHz PCI bus with
> Intel EEPro NICs.  It'll most likely be running whatever the latest 2.4
> kernel will be at the time, unless there are significant boosts in packet
> mangling performace in 2.6.

It's not exactly what you want to know but have a look at  
http://ilabws13.informatik.uni-leipzig.de/~mai97bwf/delay.html

Hope that helps a little.
Mike

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Re: [LARTC] Packet mangling latency

[Jamie Harris]

> It's not exactly what you want to know but have a look at
> http://ilabws13.informatik.uni-leipzig.de/~mai97bwf/delay.html

Looks pretty good to me!

thanks

Jamie...

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