> Source: [sk110940](https://support.checkpoint.com/results/sk/sk110940)

# sk110940 - Although CoreXL Affinity was configured to assign only a specific process to certain CPU cores, some interfaces are still being assigned to those CPU cores

| Property | Value |
|----------|-------|
| Solution ID | sk110940 |
| Date Created | 2016-04-10 |
| Last Modified | 2023-04-26 |
| Technical Level | Advanced |
| Products | Security Gateway |
| Versions | R81.20, R81.10 (EOS), R81 (EOS) |
| OS | Gaia |

## Symptoms

- * Although CoreXL Affinity was configured to assign only a specific process to certain CPU cores, some interfaces are still being assigned to those CPU cores.

  *Example*:
  * The process "*temain* " was assigned to CPU 2 and CPU 3 in the *$FWDIR/conf/fwaffinity.conf* file (either manually, or by running the "*fw ctl affinity -s -n \<process_name\> \<cpu ids\>*" command):

    ```
    
    n temain 3 2
    ```

  * Output of "*fw ctl affinity -l -r -v*" command shows that some interfaces are also assigned to CPU 2 and CPU 3:

    ```
    
    [Expert@HostName:0]# fw ctl affinity -l -r -v
    CPU 0:  eth2 (irq 83)
    CPU 1:  eth3 (irq 59)
    CPU 2:  eth1 (irq 75)
            temain
    CPU 3:  eth0 (irq 67)
            temain
    CPU 4:  fw_3
    CPU 5:  fw_2
    CPU 6:  fw_1
    CPU 7:  fw_0
    All:    in.geod in.msd fwd rad mpdaemon usrchkd vpnd in.acapd cpd cprid
    ```

  * Output of "*$FWDIR/scripts/fwaffinity_used_cpus*" script returns a list of CPU cores that are considered as "available to handle IRQs", which contains CPU 2 and CPU 3:

    ```
    
    2
    3
    4
    5
    6
    7
    ```

* This issue will not happen if manual sim affinity is used

## Cause

This issue occur on certain machines with a license limiting the number of CPU cores that can be used to a number less than the number of CPU cores on the machine.

## Solution

This solution requires authentication. Please log in to view the full solution.

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