Re: bhyve: slow network throughput between guest VM and host (and vice versa)?

From: Nils Beyer <nbe_at_vkf-renzel.de>
Date: Fri, 01 Jul 2022 11:20:56 UTC 
On 01.07.22 04:47, John-Mark Gurney wrote:
>> [...]
>> Is that expected that I'm not able to get more throughput within the bhyve network
>> stack (guest <-> host)? I was expecting way more then 10Gbit/s...
> 
> What does CPU usage look like on the host and in the VM?  This sounds
> like hitting a CPU bandwidth limit in that you're limited by pps...

1) CPU load on the host is not very high (host server is a dual AMD EPYC 7351 16-Core Processor
system):

3333 root         86    0  4230M  1202M CPU8     8   0:33  49.75% bhyve{vtnet-5:0 tx}
3333 root         87    0  4230M  1202M CPU0     0   1:03  48.67% bhyve{vcpu 0}
3333 root         85    0  4230M  1202M CPU6     6   0:29  45.52% bhyve{vcpu 5}
3333 root         84    0  4230M  1202M CPU5     5   0:47  38.64% bhyve{vcpu 2}
3390 root          4    0    17M  6472K RUN      3   0:19  38.55% iperf3
3333 root         81    0  4230M  1202M CPU4     4   0:26  32.00% bhyve{mevent}
3333 root         30    0  4230M  1202M CPU10   10   0:25  13.44% bhyve{vcpu 1}
3333 root         23    0  4230M  1202M RUN      9   0:08   5.44% bhyve{vcpu 4}
3333 root         23    0  4230M  1202M CPU7     7   0:17   5.26% bhyve{vcpu 3}


2) CPU load in the VM at around 30%


So there should be room for improvements...