Sampling rate option of nProbe is not working properly

[ioesoft]

Even after upgrading nProbe to the latest version(10.3.230302), the memory issue still remains.
So, alternatively, I'm trying to use the sampling rate option(-S="10:1:1") in order to reduce the memory usage.
But, sampling rate is not working properly.
I'm expecting that the Rx/Tx should be the same as before even though nProbe throughput will be reduced to 1/10.
However, the Rx/Tx is increasing almost by 100 times after setting "sample rate" option to "10:1:1".
Do you have any idea about this issue?

Here is the configuration of our nprobe.conf:
-I=nProbe
--zmq="tcp://192.168.0.X:5556"
--zmq-probe-mode
-i=enp3s0
-n=none
-T="@ntopng@"
-b=1
-f="ip proto not 50"
-S="10:1:1"

[ioesoft]

For more details, I'm attaching the historical chart for Rx/Tx after applying the sample rate to 10:1:1.

[lucaderi]

This is the format [--sample-rate|-S] <pkt rate>:<flow collection rate>:<flow export rate>

As you are collecting packets you need to use -S "10:1:1" as you did. However, from the report, it is unclear if you are using PF_RING. Can you please check that and report it?

Furthermore have run a few tests and everything seems to work. The difference between our lab and you is that you are capturing a lot of traffic without ZC. I have the feeling that you have severe drops. In this case sampling can screw up everything, So I suggest you check drops (add -b=1) and then eventually apply -S. If you do not want to use ZC, please at least enable RSS.

[ioesoft]

I think that we are using PF_RING. Here is the result for command "pf_ringctl status".

Regarding RSS, Is the following showing that RSS was enabled properly?
** FYI, we installed the ZC drivers but we don't use ZC for now.

[root@NHFutures_YD_TAS ~]# pf_ringcfg --list-interfaces
Name: eth0 Driver: tg3 RSS: 1 [Linux Driver]
Name: eth1 Driver: tg3 RSS: 1 [Linux Driver]
Name: eth2 Driver: tg3 RSS: 1 [Linux Driver]
Name: eth3 Driver: tg3 RSS: 1 [Linux Driver]
Name: eth4 Driver: igb RSS: 8 [Supported by ZC]
Name: eth5 Driver: igb RSS: 8 [Supported by ZC]
Name: eth6 Driver: igb RSS: 8 [Supported by ZC]
Name: eth7 Driver: igb RSS: 8 [Supported by ZC]

[root@NHFutures_YD_TAS ~]# ethtool -i eth5
driver: igb
version: 5.6.0-k
firmware-version: 1.63, 0x8000105f, 1.2836.0
expansion-rom-version:
bus-info: 0000:37:00.1
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: yes
supports-priv-flags: yes

[ioesoft]

Even in the test environment at my office(very small traffic), the sample rate is not working properly. Rx/Tx traffic shows 10 times more than before changing the sample rate to "10:1:1". Doesn't it have the same values?