Cmnt: [SRU] [Unstable/OEM-5.13/OEM-5.14] [PATCH 0/1] Fix sluggish r8169 by disaling ASPM L1.2

[Kai-Heng Feng]

Hi Koba,

On Tue, Sep 7, 2021 at 2:00 PM Koba Ko <koba.ko at canonical.com> wrote:
>
> with aspm 1.2 enabled, can't observe the issue on JSL machine.

Strangely, I am seeing the issue on JSL.

> Could you narrow down to one Realtek's model?

It's 8168h, XID 541.

> Please check logs in here
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1942830/comments/1

The ASPM setting is identical to the affected one.

Kai-Heng

>
> On Tue, Sep 7, 2021 at 12:15 PM Kai-Heng Feng
> <kai.heng.feng at canonical.com> wrote:
> >
> > BugLink: https://bugs.launchpad.net/bugs/1942830
> >
> > [Impact]
> > Realtek r8169 has abysmal network speed.
> >
> > [Fix]
> > Disable ASPM L1.2 because the device takes a long time to exit from
> > L1.2.
> >
> > [Test]
> > Use `iperf` to test network speed.
> > When ASPM L1.2 gets disabled, TX and RX and reach ~700Mbps and ~900Mbps
> > respectively.
> >
> > [Where problems could occur]
> > Disabling ASPM L1.2 can slightly increase power consumption. The CPU
> > package C-State seems to be unaffected so the increase is rather minor.
> >
> > Kai-Heng Feng (1):
> >   UBUNTU: SAUCE: r8169: Disable ASPM L1.2
> >
> >  drivers/net/ethernet/realtek/r8169_main.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > --
> > 2.32.0
> >
> >
> > --
> > kernel-team mailing list
> > kernel-team at lists.ubuntu.com
> > https://lists.ubuntu.com/mailman/listinfo/kernel-team