Fix ethernet performance on JSL and EHL

[Kai-Heng Feng]

[Impact]
Sub-optimal ethernet performance on Intel JSL and EHL platform with
Realtek PCIe NIC.

Iperf shows the network throughput can only reach around 75% of

[Fix]
The CPU idle state transition C1 -> C1E -> C0 overhead can be too high,
so disabling C1E to increase the IRQ latency and DMA speed.

[Test]
With the patch applied, iperf shows over 95% of network throughput
consistently.

[Where problems could occur]
Disabling C1E can theoretically increase power consumption slightly.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the linux-oem-6.11/6.11.0-1004.4 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-noble-linux-oem-6.11' to 'verification-done-noble-linux-oem-6.11'. If the problem still exists, change the tag 'verification-needed-noble-linux-oem-6.11' to 'verification-failed-noble-linux-oem-6.11'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 6.11.0-7.7

---------------
linux (6.11.0-7.7) oracular; urgency=medium

  * oracular/linux: 6.11.0-7.7 -proposed tracker (LP: #2079949)

  * update apparmor and LSM stacking patch set (LP: #2028253)
    - SAUCE: apparmor4.0.0 [1/99]: LSM: Infrastructure management of the sock
      security
    - SAUCE: apparmor4.0.0 [2/99]: LSM: Add the lsmblob data structure.
    - SAUCE: apparmor4.0.0 [3/99]: LSM: Use lsmblob in security_audit_rule_match
    - SAUCE: apparmor4.0.0 [4/99]: LSM: Call only one hook for audit rules
    - SAUCE: apparmor4.0.0 [5/99]: LSM: Add lsmblob_to_secctx hook
    - SAUCE: apparmor4.0.0 [6/99]: Audit: maintain an lsmblob in audit_context
    - SAUCE: apparmor4.0.0 [7/99]: LSM: Use lsmblob in security_ipc_getsecid
    - SAUCE: apparmor4.0.0 [8/99]: Audit: Update shutdown LSM data
    - SAUCE: apparmor4.0.0 [9/99]: LSM: Use lsmblob in security_current_getsecid
    - SAUCE: apparmor4.0.0 [10/99]: LSM: Use lsmblob in security_inode_getsecid
    - SAUCE: apparmor4.0.0 [11/99]: Audit: use an lsmblob in audit_names
    - SAUCE: apparmor4.0.0 [12/99]: LSM: Create new security_cred_getlsmblob LSM
      hook
    - SAUCE: apparmor4.0.0 [13/99]: Audit: Change context data from secid to
      lsmblob
    - SAUCE: apparmor4.0.0 [14/99]: Netlabel: Use lsmblob for audit data
    - SAUCE: apparmor4.0.0 [15/99]: LSM: Ensure the correct LSM context releaser
    - SAUCE: apparmor4.0.0 [16/99]: LSM: Use lsmcontext in
      security_secid_to_secctx
    - SAUCE: apparmor4.0.0 [17/99]: LSM: Use lsmcontext in
      security_lsmblob_to_secctx
    - SAUCE: apparmor4.0.0 [18/99]: LSM: Use lsmcontext in
      security_inode_getsecctx
    - SAUCE: apparmor4.0.0 [19/99]: LSM: lsmcontext in
      security_dentry_init_security
    - SAUCE: apparmor4.0.0 [20/99]: LSM: security_lsmblob_to_secctx module
      selection
    - SAUCE: apparmor4.0.0 [21/99]: Audit: Create audit_stamp structure
    - SAUCE: apparmor4.0.0 [22/99]: Audit: Allow multiple records in an
      audit_buffer
    - SAUCE: apparmor4.0.0 [23/99]: Audit: Add record for multiple task security
      contexts
    - SAUCE: apparmor4.0.0 [24/99]: audit: multiple subject lsm values for
      netlabel
    - SAUCE: apparmor4.0.0 [25/99]: Audit: Add record for multiple object contexts
    - SAUCE: apparmor4.0.0 [26/99]: LSM: Remove unused lsmcontext_init()
    - SAUCE: apparmor4.0.0 [27/99]: LSM: Improve logic in security_getprocattr
    - SAUCE: apparmor4.0.0 [28/99]: LSM: secctx provider check on release
    - SAUCE: apparmor4.0.0 [29/99]: LSM: Single calls in socket_getpeersec hooks
    - SAUCE: apparmor4.0.0 [30/99]: LSM: Exclusive secmark usage
    - SAUCE: apparmor4.0.0 [31/99]: LSM: Identify which LSM handles the context
      string
    - SAUCE: apparmor4.0.0 [32/99]: AppArmor: Remove the exclusive flag
    - SAUCE: apparmor4.0.0 [33/99]: LSM: Add mount opts blob size tracking
    - SAUCE: apparmor4.0.0 [34/99]: LSM: allocate mnt_opts blobs instead of module
      specific data
    - SAUCE: apparmor4.0.0 [35/99]: LSM: Infrastructure management of the key
      security blob
    - SAUCE: apparmor4.0.0 [36/99]: LSM: Infrastructure management of the mnt...