From: Javen Xu <javen_xu@realsil.com.cn>
This patch series adds RSS (Receive Side Scaling) support for the r8169
ethernet driver, specifically for RTL8127 (RTL_GIGA_MAC_VER_80).
RSS enables packet distribution across multiple receive queues, which can
significantly improve network throughput on multi-core systems by allowing
parallel processing of incoming packets.
Key features:
- Multi-queue RX support (up to 8 queues)
- MSI-X interrupt with vector mapping
- Dynamic queue configuration via ethtool (-L)
- RSS hash computation for flow classification
Experiments:
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%.
Other Experiments:
Link: https://lore.kernel.org/netdev/0A5279953D81BB9C+f50c9b49-3e5d-467f-b69a-7e49ed223383@radxa.com/
Javen Xu (7):
r8169: prepare for multi irqs and napi
r8169: refactor RX path to prepare for multi-queue
r8169: add support for new interrupt mapping
r8169: enable new interrupt mapping
r8169: add support and enable rss
r8169: move struct ethtool_ops
r8169: add get_channel support for ethtool
drivers/net/ethernet/realtek/r8169_main.c | 1099 ++++++++++++++++++---
1 file changed, 950 insertions(+), 149 deletions(-)
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2.43.0