# High CPU usage on SND cores when high number of interfaces are configured

## Product
Security Gateways, VSX (Traditional)

## Version
R80.40 (EOS), R81 (EOS), R81.10 (EOS), R81.20

## Last Modified
2024-06-05

## Symptoms
- SND (Secure Network Dispatcher) cores are highly utilized.
- A high number of interfaces (either physical or VLANs) are configured on the Security Gateway.
- The output of the "`perf top -C SND CPU ID`" command shows that the function responsible for elevated CPU usage is `get_dev2ifn_hash`.

## Cause
With many interfaces, more usage is consumed in locating the proper route and relevant interface.

## Solution
This problem was fixed. The fix is included in:
- [Jumbo Hotfix Accumulator for R81.20](https://sc1.checkpoint.com/documents/Jumbo_HFA/R81.20/Default.htm) starting from Take 54
- [Jumbo Hotfix Accumulator for R81.10](https://sc1.checkpoint.com/documents/Jumbo_HFA/R81.10/Default.htm) starting from Take 141
- [Jumbo Hotfix Accumulator for R81](https://sc1.checkpoint.com/documents/Jumbo_HFA/R81/Default.htm) starting from Take 99

If you choose not to upgrade, Check Point can supply a **Hotfix**. [Contact Check Point Support](https://www.checkpoint.com/support-services/.contact-support/) to get a Hotfix for this issue.

A Support Engineer will make sure the Hotfix is compatible with your environment before providing the Hotfix.

For faster resolution and verification, please collect [CPinfo files](http://supportcontent.checkpoint.com/solutions?id=sk92739) from the Security Management Server and Security Gateways involved in the case.

**Hotfix installation instructions:**
Refer to [sk168597 - How to install a Hotfix](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk168597).

#### NOTE
This solution has been verified for the specific scenario, described by the combination of Product, Version and Symptoms. It may not work in other scenarios.