linux-kernel - Re: [RFC] [PATCH net-next v7 0/4] r8169: Implement dynamic ASPM mechanism for recent 1.0/2.5Gbps Realtek NICs

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Date:   Tue, 26 Oct 2021 11:53:56 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     Heiner Kallweit <hkallweit1@...il.com>,
        nic_swsd <nic_swsd@...ltek.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Anthony Wong <anthony.wong@...onical.com>,
        Linux Netdev List <netdev@...r.kernel.org>,
        Linux PCI <linux-pci@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] [PATCH net-next v7 0/4] r8169: Implement dynamic ASPM
 mechanism for recent 1.0/2.5Gbps Realtek NICs

Hi Heiner,

On Sat, Oct 16, 2021 at 3:54 PM Kai-Heng Feng
<kai.heng.feng@...onical.com> wrote:
>
> The purpose of the series is to get comments and reviews so we can merge
> and test the series in downstream kernel.
>
> The latest Realtek vendor driver and its Windows driver implements a
> feature called "dynamic ASPM" which can improve performance on it's
> ethernet NICs.
>
> Heiner Kallweit pointed out the potential root cause can be that the
> buffer is to small for its ASPM exit latency.
>
> So bring the dynamic ASPM to r8169 so we can have both nice performance
> and powersaving at the same time.
>
> For the slow/fast alternating traffic pattern, we'll need some real
> world test to know if we need to lower the dynamic ASPM interval.

Do you think we can include this to downstream kernel in its current form?

Kai-Heng

>
> v6:
> https://lore.kernel.org/netdev/20211007161552.272771-1-kai.heng.feng@canonical.com/
>
> v5:
> https://lore.kernel.org/netdev/20210916154417.664323-1-kai.heng.feng@canonical.com/
>
> v4:
> https://lore.kernel.org/netdev/20210827171452.217123-1-kai.heng.feng@canonical.com/
>
> v3:
> https://lore.kernel.org/netdev/20210819054542.608745-1-kai.heng.feng@canonical.com/
>
> v2:
> https://lore.kernel.org/netdev/20210812155341.817031-1-kai.heng.feng@canonical.com/
>
> v1:
> https://lore.kernel.org/netdev/20210803152823.515849-1-kai.heng.feng@canonical.com/
>
> Kai-Heng Feng (4):
>   PCI/ASPM: Add pcie_aspm_capable()
>   r8169: Enable chip-specific ASPM regardless of PCIe ASPM status
>   r8169: Use mutex to guard config register locking
>   r8169: Implement dynamic ASPM mechanism
>
>  drivers/net/ethernet/realtek/r8169_main.c | 70 ++++++++++++++++++++---
>  drivers/pci/pcie/aspm.c                   | 11 ++++
>  include/linux/pci.h                       |  2 +
>  3 files changed, 74 insertions(+), 9 deletions(-)
>
> --
> 2.32.0
>