Hi,

Wanted to check what the expected performance of pmacctd is for the following config. Using pmacctd (v1.7.7 docker image with nfprobe plugin on an Ubuntu 22.04, linux kernel 5.15) with the key portion of the config as follows:

```
aggregate: src_host, dst_host, in_iface, out_iface, timestamp_start, timestamp_end, src_port, dst_port, proto, tos, tcpflags
timestamps_secs: true

plugin_pipe_size: 102400
nfprobe_timeouts: tcp=5:tcp.rst=5:tcp.fin=5:udp=5:icmp=5:general=5:maxlife=5

sampling_rate: 20
```

With iperf2 (-l 1440 -P 1 -b 1G) and around 100k packets per second, I am seeing CPU util of ~25-30% by pmacctd. Is this within expected behaviour?

Regards,
Chander

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