Re: [RFC Patch net-next v1 0/9] r8169: add RSS support for RTL8127

[FUKAUMI Naoki]

Hi Javen,

Thank you very much for your nice work!

On 4/20/26 11:19, javen wrote:
> From: Javen Xu <javen_xu@xxxxxxxxxxxxxx>
>
> This series patch adds RSS support for RTL8127 in the r8169 driver.
>
> Currently, without RSS support, a single CPU core handles all incoming
> traffic. Under heavy loads, this single core becomes a bottleneck, causing
> high softirq usage and leading to unstable and degraded network throughput.
>
> As a result, we add rss support for RTL8127. This RFC patch is just for
> discussing. And we do some experiments on AMD platform. Below is the
> result.
>
> Platform: AMD Ryzen Embedded R2514 with Radeon Graphics(4 Cores/8 Threads)
> Arch: x86_64
> Test command:
>    Server: iperf3 -s
>    Client: iperf3 -c 192.168.2.1 -P 20 -t 3600
> Monitor: mpstat -P ALL 1
>
> Before this patch (Without RSS):
>    Throughput: Unstable, fluctuating between 3.76 Gbits/sec and
>    8.2 Gbits/sec.
>    CPU Usage: A single CPU core is fully occupied with softirq reaching
>    up to 96%.
>
> After this patch (With RSS enabled):
>    Throughput: Stable at 9.42 Gbits/sec.
>    CPU Usage: The traffic load is evenly distributed across multiple CPU
>    cores. The maximum softirq on a single core dropped to 63%.

Platform: Radxa ROCK 5T (RK3588: 4x Cortex-A76, 4x Cortex-A55)
Arch: aarch64
Configuration: smp_affinity is set to use only the big cores.

Vanilla Linux v7.0:
Throughput: 5.5 Gbps (4.3 Gbps with -P 20)
CPU Usage: ~100% on a single A76 core.

Linux v7.0 + this patch series:
Throughput: 9.4 Gbps with -P 20
CPU Usage: distributed across all four A76 cores.

Looks good to me!

Feel free to use:
Tested-by: FUKAUMI Naoki <naoki@xxxxxxxxx>

Best regards,

--
FUKAUMI Naoki
Radxa Computer (Shenzhen) Co., Ltd.

> Patch summary:
>    Patch 1: Adds necessary macro and register definitions for RSS.
>    Patch 2-4: Support NAPI and multi RX/TX queues.
>    Patch 5-6: Support MSI-X and enables it specifically for RTL8127.
>    Patch 7: Enables RSS for RTL8127.
>    Patch 8-9: Adds ethtool support to configure the number of RX queues.
>    
> Javen Xu (9):
>    r8169: add some register definitions
>    r8169: add napi and irq support
>    r8169: add support for multi tx queues
>    r8169: add support for multi rx queues
>    r8169: add support for msix
>    r8169: enable msix for RTL8127
>    r8169: add support and enable rss
>    r8169: move struct ethtool_ops
>    r8169: add support for ethtool
>
>   drivers/net/ethernet/realtek/r8169_main.c | 1437 ++++++++++++++++++---
>   1 file changed, 1238 insertions(+), 199 deletions(-)