Stealthwatch Flow Sensor high CPU usage

Vishnu_RR — Mon, 04 Sep 2023 10:05:36 GMT

Hi guys,

The FS is capturing the traffic from the Switch with the help of the SPAN protocol. Few CPU cores show the CPU utilization close to 90%.

This usage is in the range of 82%-90% always. So I just want to know if is this normal behavior or if I need to take some action. This physical appliance with model 3210.

Re: Stealthwatch Flow Sensor high CPU usage

lohan — Wed, 20 Sep 2023 05:29:42 GMT

Hi Vishnu_RR,

First of all, if you can create a TAC case to earn professional assistance, it would be really help.

And then, since you have mention that "This usage is in the range of 82%-90% always"

I would like suggest you consider upgrading hardware or optimizing configurations:
If the high CPU utilization is negatively impacting performance, it may be necessary to upgrade the hardware to a more powerful model or optimize configurations to reduce the load on the CPU.

This could involve adjusting traffic capture settings, tuning the SPAN protocol, or redistributing traffic flows.

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You can also learn more about Secure Network Analytics (formerly known as Stealthwatch) through our live Ask the Experts (ATXs) session. Check out Cisco Network Security ATXs Resources [https://community.cisco.com/t5/security-knowledge-base/cisco-network-security-ask-the-experts-resources/ta-p/4416493] to view the latest schedule for upcoming sessions, as well as the useful references, e.g. online guides, FAQs.
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Best Regards,
Henry

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Stealthwatch Flow Sensor high CPU usage

Re: Stealthwatch Flow Sensor high CPU usage