[Jool-list] Jool performance help

[Alberto Leiva]

Thanks, Tore!

I would like to add the following:

> $ modprobe jool
> $ modprobe jool_siit

Are you sure that this is what you want?

I'm not sure why you would want to insert both modules in the same
namespace. One is a SIIT and the other one is a NAT64. Particularly if
you're performance-testing, I'd normally expect you to test one *or*
the other.
On Thu, Jul 12, 2018 at 2:09 AM Tore Anderson <tore at fud.no> wrote:
>
> * ali at acreto.io
>
> > I’ve installed Jool kernel modules and userspace application on Ubuntu. jool_siit is running in a network namespace and I’m using veth pairs for network I/O. Please find attached details of my test environment.
> >
> > However, while running the TCP throughput test, I was able to achieve only 6Mbps of throughput. I’ve tested it by doing both *GRO on and off* on all the relevant interfaces with no performance improvements.
> >
> > We are evaluating Jool for carrier grade NAT64 in our network infrastructure.
> >
> > I was wondering if you can help me to improve performance results. Is there any tweaks or workarounds to overcome the performance limitation by Jool.
>
> Hi Muhammad,
>
> First off, you're definitively not hitting the performance limit of Jool - it
> easily scales to multiple Gb/s of throughput. There must be something else
> that is causing your issues.
>
> Even though you said you turned GRO off, my suspicion would be something with
> packet sizes. Are there other offload settings you can turn off? MTU settings
> on all the interfaces are all okay?
>
> Also, check with tcpdump on all the relevant interfaces to see if the test
> traffic is causing lots of ICMP Frag Needed/Packet Too Big errors.
>
> Tore
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