High throughput bgp links using gentoo + stipped kernel

Sun May 19 13:36:12 UTC 2013

On Sun, 19 May 2013, William Herrin wrote:

> On Sat, May 18, 2013 at 11:39 AM, Nick Khamis <symack at gmail.com> wrote:
>> We are transmitting an average of 700Mbps with packet sizes upwards of
>> 900-1000 bytes when the traffic graph begins to flatten. We also start
>> experiencing some crashes at that point, and not have been able to
>> pinpoint that either.
>
> Hi Nick,
>
> You're done. You can buy more recent server hardware and get another
> small bump. You may be able to tweak interrupt rates from the NICs as
> well, trading latency for throughput. But basically you're done:
> you've hit the upper bound of what slow-path (not hardware assisted)
> networking can currently do.
>
> Options:
>
> 1. Buy equipment with a hardware fast path, such as the higher end
> Juniper and Cisco routers.

I think you've misinterpreted his numbers.  He's using 1gb ethernet 
interfaces, so that's 700 mbit/s.  He didn't mention if he'd done any IP 
stack tuning, or what sort of crashes he's having...but people have been 
doing higher bandwith than this on Linux for years.

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