On 4.16 with Centos stream Cores 4.16(having RHEL9.4), Burstable Pods have reserved cpu affinity when performance profile is applied . By default when performance profile is applied the worker nodes are in cgroupv1 environment . 

    4.16.0-0.nightly-2024-01-23-071601

    Everytime

    1. setup a 4.16 cluster with RHCOS9.4
    2. Apply a performance profile as shown below: 

{code:none}
    apiVersion: performance.openshift.io/v2
kind: PerformanceProfile
metadata:
  name: performance
spec:
  cpu:
    isolated: 1,3-11,13,15-23
    reserved: 0,2,12,14
  hugepages:
    defaultHugepagesSize: 1G
    pages:
    - count: 1
      node: 0
      size: 1G
    - count: 128
      node: 1
      size: 2M
  machineConfigPoolSelector:
    machineconfiguration.openshift.io/role: worker-cnf
  nodeSelector:
    node-role.kubernetes.io/worker-cnf: ''
  numa:
    topologyPolicy: single-numa-node
  realTimeKernel:
    enabled: true
  workloadHints:
    highPowerConsumption: true
    perPodPowerManagement: false
    realTime: true

3. Wait for the nodes to be ready , Check any burstable pod for example ovs pods: 
 
4. Login to the node and check the cpu affinity of all the burstable pods:

   find /sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/  -type f -name "cpuset.cpus" -exec sh -c 'echo $1; cat "$1"' _ {} \;

  /sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-podf29770f9_bd29_45d3_ac6a_addff93fbb57.slice/crio-ccd741785424a6bcd390710f2af0b72794b9d6fd433490fac33f4bcf135a2583.scope/cpuset.cpus
0,2,12,14
/sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-podf29770f9_bd29_45d3_ac6a_addff93fbb57.slice/crio-b4a42f6d744ba0f01d2f1021cd4c48019f477eacdd2691518b8d922af830e664.scope/cpuset.cpus
0,2,12,14
/sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-podf29770f9_bd29_45d3_ac6a_addff93fbb57.slice/crio-30d82ae0b0173dbe4f150d232b50a5f72f7357a776a0b4bd1450c96f13c136ad/cpuset.cpus
0-23
/sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-podf29770f9_bd29_45d3_ac6a_addff93fbb57.slice/cpuset.cpus
0-23
/sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-podf29770f9_bd29_45d3_ac6a_addff93fbb57.slice/crio-b75334c626b0b6fba7de1553e7345a7e0e301aaa960ce0cb9f9177c36e5a152f.scope/cpuset.cpus
0,2,12,14
/sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-pod11c296dd_2ef9_4cb2_99ec_7284f103298b.slice/crio-8f62a6905d5a1889e733866f50d2f224417bae7778b3bb219a915810d8822dd7.scope/cpuset.cpus
0,2,12,14
/sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-pod11c296dd_2ef9_4cb2_99ec_7284f103298b.slice/crio-5423c7659403f45b6cdec01e5c7f4d9c86b58db67b4e7c0aeca5460fbeda09ab.scope/cpuset.cpus
0,2,12,14
/sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-pod11c296dd_2ef9_4cb2_99ec_7284f103298b.slice/crio-e75a28c898b3716d59444166fe9d42a4f3a9b1e36739b2d53dde7cf988015f00.scope/cpuset.cpus
0,2,12,14
/sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-pod11c296dd_2ef9_4cb2_99ec_7284f103298b.slice/crio-e8567fcc6f0addcce6be7fbb4ec19204370e52eb2d79260b58edf65d5b6c14f7.scope/cpuset.cpus
0,2,12,14
/sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-pod11c296dd_2ef9_4cb2_99ec_7284f103298b.slice/crio-4012c6ffd6aab41bd57fbe1fa35f3e0ec4dc6f7d8a754b26a00187491b937244/cpuset.cpus
0-23
/sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-pod11c296dd_2ef9_4cb2_99ec_7284f103298b.slice/crio-65a70d677c7dd50fe805acf206a8145cf12a18f1f8f081ab19c3ef77123c3422.scope/cpuset.cpus
0,2,12,14
/sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-pod11c296dd_2ef9_4cb2_99ec_7284f103298b.slice/crio-ce43dad8d51e99ca6dcc0404df30c44ea878e399c494fb33510ce6a86eb8f8ee.scope/cpuset.cpus
0,2,12,14
/sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-pod11c296dd_2ef9_4cb2_99ec_7284f103298b.slice/crio-15b5b9d5c520061bfe27548117f75e75b0752b0261999ebeb837c99bd98097e8.scope/cpuset.cpus
0,2,12,14
/sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-pod11c296dd_2ef9_4cb2_99ec_7284f103298b.slice/cpuset.cpus
0-23
/sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-pod15a21b23_f299_4e5f_9900_ccdbf1eb1bf1.slice/crio-dbaa0baf540c1ccfdd9c0f5f495d4a481110569de4c5e3b27dc6587ae705bf1e.scope/cpuset.cpus
0,2,12,14
/sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-pod15a21b23_f299_4e5f_9900_ccdbf1eb1bf1.slice/crio-12c49e10d324436150483fb0c7e6eb670d07fb8ecf2983b10c2f1af8ff9e1cc9.scope/cpuset.

    /sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-pod94595293_dddd_419d_90d0_588fdd95c02a.slice/crio-54134c20334e1598760dc0ea0c4b6002c21d8fe6fa88d008e40a691d76750640.scope/cpuset.cpus
0-23
 /sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-pod94595293_dddd_419d_90d0_588fdd95c02a.slice/crio-92e9d2f3597b5d069e5c9497f1d0454f79f7ccb0420ede964bf48d8d93cc8b24.scope/cpuset.cpus
0-23
 /sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-pod94595293_dddd_419d_90d0_588fdd95c02a.slice/crio-861c0c6b1d46425dfe5ad033f1895c0c3764a9c1a207b1ae442562242610aa8a/cpuset.cpus
0-23
 /sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-pod94595293_dddd_419d_90d0_588fdd95c02a.slice/cpuset.cpus
0-23
 /sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-podfd596fb3_f607_4fb8_b179_818ba7afaf94.slice/crio-e0f5507d81bcb3a99e12f48efa930538ef90b5e3c476fba7566a9e790622daf6/cpuset.cpus
0-23
 /sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-podfd596fb3_f607_4fb8_b179_818ba7afaf94.slice/crio-1b6666a932315da54a6f5eaf23adbdc9fcb0f1da320c4f8946607d7c942412ce.scope/cpuset.cpus
0-23
 /sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-podfd596fb3_f607_4fb8_b179_818ba7afaf94.slice/crio-767eaa6b3aeeb1f97f4129c33f3e5b5abe43d4363e02ba1f2e0262946c6471c9.scope/cpuset.cpus
0-23
 /sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-podfd596fb3_f607_4fb8_b179_818ba7afaf94.slice/crio-2ff939e9a17fc6604053fdba56f737ecc5d60f232df3e570a3b118de472ddbd1.scope/cpuset.cpus
0-23
 /sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-podfd596fb3_f607_4fb8_b179_818ba7afaf94.slice/crio-d07d70934fd16b7317fe2c71d08b78682197304f4b483e95cbba9c7c312fb6a0.scope/cpuset.cpus
0-23
 /sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-podfd596fb3_f607_4fb8_b179_818ba7afaf94.slice/crio-de208abde6acc831cd0fc8db31a36b450da8b2009ae1c7242674b4b03fdf32ac.scope/cpuset.cpus
0-23
 /sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-podfd596fb3_f607_4fb8_b179_818ba7afaf94.slice/crio-e1b430b139a431166cb83861ac386638cda13cdcb4e6727e62cd168d5c93064b.scope/cpuset.cpus
0-23
 /sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-podfd596fb3_f607_4fb8_b179_818ba7afaf94.slice/crio-ba0f3c8675909f536b938b2d4781f58a3cd7b1722ad21ac78e1867a72717c7b5.scope/cpuset.cpus
0-23
 /sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-podfd596fb3_f607_4fb8_b179_818ba7afaf94.slice/cpuset.cpus
0-23
 /sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-pod04f7a6a5dec077a184ccc47965380cfa.slice/crio-54bb6e2a0e5b243f5dff0d0db28aef1a82d8d700955f2ccd067c2503f267c91a.scope/cpuset.cpus
0-23
 /sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-pod04f7a6a5dec077a184ccc47965380cfa.slice/crio-95eaa9ff025e987c69712f73d2b3c461ba78e1a04d0ecaf74eed8368e8c68298.scope/cpuset.cpus
0-23
 /sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-pod04f7a6a5dec077a184ccc47965380cfa.slice/cpuset.cpus
0-23
 /sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-pod04f7a6a5dec077a184ccc47965380cfa.slice/crio-4b1d385abcb80f4c30cc1e55a5fc5c9ac6d340db66dc09dcece2d9a2456e728f/cpuset.cpus
0-23
 /sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-pod7e5f1dbb_75e9_4d51_aad3_00e01073303b.slice/crio-4843863c7696cf233c8a6c76fdda47190afdcad277eb3628a5f2022505939e71.scope/cpuset.cpus
0-23
 /sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-pod7e5f1dbb_75e9_4d51_aad3_00e01073303b.slice/crio-28b6c89ad2131bcdd23cd2d178c3759adef41ecccf52fb26faf08ed2dd2c5b3a.scope/cpuset.cpus
0-23
 /sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-pod7e5f1dbb_75e9_4d51_aad3_00e01073303b.slice/crio-7b3a017f667eb1c8becefa7ec388a0f9d7a9a90c94fb5f19b320a65200a8f836/cpuset.cpus
0-23
 /sys/fs/cgroup/cpuset/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-pod7e5f1dbb_75e9_4d51_aad3_00e01073303b.slice/cpuset.cpus
0-23

 1.   Issue occurs only on  CentOS Stream CoreOS release 4.16  and with cgroup version v1 and v2 
 2.   Issue does not occur on RHCOS 4.16 which is having RHEL9.2 OS contents 
 3.   Issue occurs on CentOS Stream CoreOS release 4.16  and with cgroup version v1, v2 and on both runtimes (crun and runc)