[Bug 2077858] Re: Fix ethernet performance on JSL and EHL

This bug is awaiting verification that the linux-
hwe-6.11/6.11.0-9.9~24.04.1 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-
hwe-6.11' to 'verification-done-noble-linux-hwe-6.11'. If the problem
still exists, change the tag 'verification-needed-noble-linux-hwe-6.11'
to 'verification-failed-noble-linux-hwe-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!


** Tags added: kernel-spammed-noble-linux-hwe-6.11-v2 verification-needed-noble-linux-hwe-6.11

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https://bugs.launchpad.net/bugs/2077858

Title:
Fix ethernet performance on JSL and EHL

Status in HWE Next:
New
Status in linux package in Ubuntu:
Fix Released
Status in linux-oem-6.11 package in Ubuntu:
New
Status in linux source package in Noble:
Fix Committed
Status in linux-oem-6.11 source package in Noble:
New
Status in linux source package in Oracular:
Fix Released
Status in linux-oem-6.11 source package in Oracular:
New

Bug description:
[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.

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