Slow performance with Intel X540-T2 10Gb NIC

[Eric Joyner]

(Replying-all this time)

Did you try to set these settings that ESnet recommends?
https://fasterdata.es.net/host-tuning/freebsd/

We don't use iperf3 here at Intel (we use netperf instead), so I'm not sure
I can be much help diagnosing what's wrong.

On Wed, Jul 20, 2016 at 5:39 PM Chris Dunbar <chris at dunbar.net> wrote:

> Hello,
>
> I am new to FreeBSD and recently built a file server out of new components
> running FreeBSD 10.3. I installed an Intel X540-T2 10 Gb NIC and am
> experiencing what I consider to be slow transfer speeds. I am using iperf3
> to measure the speed and test the results of modifications. So far nothing
> I have done has made a noticeable difference. If I run iperf3 -s on the
> FreeBSD server, I see transfer speeds of approximately 1.6 Gb/s. If I run
> iperf3 in client mode, the speed improves to ~2.75 Gb/s. However, if I
> replace FreeBSD with CentOS 7 on the same hardware, I see iperf3 speeds
> surpassing 8 GB/s. The other end of my iperf3 test is a Windows 10 box that
> also has an Intel X540-T2 installed.
>
> I did notice that FreeBSD 10.3 (and 11.0 alpha 6 for that matter) includes
> a slightly older Intel driver (v3.1.13-k). I managed to build a custom
> kernel that removed the Intel PRO/10GbE PCIE NIC drivers. That allowed me
> to manually load the latest 3.1.14 driver downloaded from Intel's web site.
> Unfortunately that did not produce any improvements. I am working my way
> through man tuning() and some other articles on network performance. So far
> nothing I tweak makes a noticeable difference. I'm increasingly skeptical
> that I am going to find a setting or two that more than doubles the speed I
> am currently experiencing.
>
> I am open to any and all suggestions at this point.
>
> Thank you!
> Chris
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