scaling linux-based router hardware recommendations

Joe Holden lists at
Tue Jan 27 22:32:13 UTC 2015

I get more than that with realtek nics on x86, problem is high interrupt 
rates even with msix, intel fixes some of those and chelsio makes it all 
go away...

Just saying :)

On 26/01/2015 23:27, Faisal Imtiaz wrote:
> Hi Micah,
> There is a segment in the Hardware Side of the industry that produces "Network Appliances".
> (Folks such as Axiomtek, Lanner Electronics, Caswell Networks, Portwell  etc etc)
> These appliances are commonly used as a commercial (OEM) platform for a variety of uses..
> Routers, Firewalls, Specialized network applications etc.
> Our internal testing ( informal), matches up with the commonly quoted PPS handling by the different product vendors who incorporate these appliances in their network product offerings.
> i3/i5/i7 (x86) based network appliances will forward traffic as long as pps does not exceed 1.4million
>                 (In our testing we found the pps to be limiting factor and not the amount of traffic being moved)
>                 (will easily handle 6G to 10G of traffic
> Core2duo (x86) based network appliances will forward traffic as long as pps does not exceed 600,0000 pps
>                 (will easily handle 1.5G to 2G of traffic)
> Atom based (x86) network appliances will forward traffic as long as pps does not exceed 250,000 pps.
> ----------------------------------------
> Of course, if you start to bog down the router with lots of NAT/ACL/ Bridge Rules (i.e. the CPU has to get involved in traffic management) then your actual performance will be degraded.
> Regards.
> Faisal Imtiaz
> Snappy Internet & Telecom
> 7266 SW 48 Street
> Miami, FL 33155
> Tel: 305 663 5518 x 232
> Help-desk: (305)663-5518 Option 2 or Email: Support at
> ----- Original Message -----
>> From: "micah anderson" <micah at>
>> To: nanog at
>> Sent: Monday, January 26, 2015 5:53:54 PM
>> Subject: scaling linux-based router hardware recommendations
>> Hi,
>> I know that specially programmed ASICs on dedicated hardware like Cisco,
>> Juniper, etc. are going to always outperform a general purpose server
>> running gnu/linux, *bsd... but I find the idea of trying to use
>> proprietary, NSA-backdoored devices difficult to accept, especially when
>> I don't have the budget for it.
>> I've noticed that even with a relatively modern system (supermicro with
>> a 4 core 1265LV2 CPU, with a 9MB cache, Intel E1G44HTBLK Server
>> adapters, and 16gig of ram, you still tend to get high percentage of
>> time working on softirqs on all the CPUs when pps reaches somewhere
>> around 60-70k, and the traffic approaching 600-900mbit/sec (during a
>> DDoS, such hardware cannot typically cope).
>> It seems like finding hardware more optimized for very high packet per
>> second counts would be a good thing to do. I just have no idea what is
>> out there that could meet these goals. I'm unsure if faster CPUs, or
>> more CPUs is really the problem, or networking cards, or just plain old
>> fashioned tuning.
>> Any ideas or suggestions would be welcome!
>> micah

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