performance issue within VNET jail

[Michael Grimm]

Kristof Provost <kristof at sigsegv.be> wrote:
> 
> On 21 Dec 2017, at 21:24, Michael Grimm wrote:

>> I do have to admit that I am lost here, and that I cannot think about what is going wrong. The last download I did try at my old severs has been some weeks ago. Ever since I did upgrade FreeBSD 11.1-STABLE, and I did move my infrastructure from bare metal to cloud, thus I cannot test anymore if my old servers would have shown that performance issue in the meantime.
>> 
>> Thus any feedback is highly recommended!

> Can you try turning off TSO? (`ifconfig $ifname -tso`)
> 
> There have been issues with pf and TSO checksums, which looked a lot like this (i.e. bad TCP performance). Those problems should be fixed, but this is easy to test.
> 

I did try it, but without success. 

This only worked for the external interface, though. Both epairX interfaces didn't accept that command:
	ifconfig: -tso: Invalid argument

I did mention that I previously tried "sysctl net.inet.tcp.tso=0". That shoukld do the same, right?

Thanks and regards,
Michael