This bug is awaiting verification that the linux/6.8.0-48.48 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' to 'verification-done-noble-linux'. If
the problem still exists, change the tag 'verification-needed-noble-
linux' to 'verification-failed-noble-linux'.


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-v2 verification-needed-noble-linux

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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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