[SRU] [N/O/OEM-6.11] [PATCH 0/1] Fix ethernet performance on JSL and EHL

[Kai-Heng Feng]

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

[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.

Kai-Heng Feng (1):
  intel_idle: Disable promotion to C1E on Jasper Lake and Elkhart Lake

 drivers/idle/intel_idle.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

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2.43.0