Re: [RFC PATCH net-next v2 7/7] net: ravb: Use NAPI threaded mode on 1-core CPUs with GbEth IP

From: Sergey Shtylyov
Date: Sat Feb 10 2024 - 14:00:24 EST

On 2/6/24 12:19 PM, Paul Barker wrote:

> NAPI Threaded mode (along with the previously enabled SW IRQ Coalescing)
> is required to improve network stack performance for single core SoCs
> using the GbEth IP (currently the RZ/G2L SoC family and the RZ/G3S SoC).
> For the RZ/G2UL, network throughput is greatly increased by this change
> (results obtained with iperf3) for all test cases except UDP TX:
> * TCP TX: 30% more throughput
> * TCP RX: 9.8% more throughput
> * UDP TX: 9.7% less throughput
> * UDP RX: 89% more throughput
> For the RZ/G3S we see improvements in network throughput similar to the
> RZ/G2UL.
> The improvement of UDP RX bandwidth for the single core SoCs (RZ/G2UL &
> RZ/G3S) is particularly critical. NAPI Threaded mode can be disabled at
> runtime via sysfs for applications where UDP TX performance is a
> priority.
> Signed-off-by: Paul Barker <paul.barker.ct@xxxxxxxxxxxxxx>

Reviewed-by: Sergey Shtylyov <s.shtylyov@xxxxxx>


MBR, Sergey