Thanks to all for the excellent information and pointers. We might be making some performance measurements on our own and will most defintely publish them.
Mikkel : does the SysKonnect driver support NAPI? The numbers look low for 2Ghz processor compared to what Click folks publish.
Thanks Again! Surya
From: Mikkel Christiansen <mixxel@cs.auc.dk> To: Surya Srinivasan <surya_srinivasan@hotmail.com> CC: linux-net@vger.kernel.org Subject: Re: Linux router forwarding performance Date: Tue, 1 Jun 2004 22:57:48 +0200
Hi
As part of our packet filtering project we did some performance measurements where we do up to 180kps with NAPI drivers.
see more: http://www.cs.auc.dk/~mixxel/cf/experiments.html
Cheers Mikkel
Quoting Surya Srinivasan <surya_srinivasan@hotmail.com>:
>
>
> We are planning to use a linux PC as a router in our lab. I was wondering if
> anyone has recently measured the forwarding rate using a standard PC (say
> Pentium)? Have there been any changes to the kernel to improve the
> forwarding rate?
>
> The best performance I have seen so far is with the Click modular router (
> http://www.pdos.lcs.mit.edu/papers/click:tocs00/paper.pdf ). According to
> their study on a 700Mhz Pentium (64 byte packets)
> Linux does 75kpps
> Linux polling 300kpps (Polling amortizes the device handling overhead over
> several packets when packet rates are high is my understanding. It also
> avoids the receive livelock issue).
> Is receive livelock still an issue with Linux today? Or is this avoided by
> throttling the receive interfaces?
>
> Is there anyone using polling mode for better forwarding rates?
>
> I have been looking for documentation in this regard and would appreciate
> any pointers.
>
> If there is a more appropriate list for such questions kindly point me to
> the right list.
>
> thanks
> Surya
>
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