lkml.org 
[lkml]   [2024]   [Apr]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [net-next RFC v3 6/7] net: ravb: Use NAPI threaded mode on 1-core CPUs with GbEth IP
From
Date
On 4/15/24 12:48 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).
>
> This patch gives the following improvements during testing with iperf3.
>
> * RZ/G2UL:
> * TCP TX: +32% bandwidth (638Mbps -> 841Mbps)
> * TXP RX: +8.8% bandwidth (667Mbps -> 726Mbps)
> * UDP RX: +104% bandwidth (53Mbps -> 108Mbps)
>
> * RZ/G3S:
> * TCP TX: 29% bandwidth (529Mbps -> 681Mbps)
> * UDP RX: +1290% bandwidth (6.46Mbps -> 90Mbps)
>
> * RZ/Five:
> * UDP RX: Test no longer crashes (0 -> 20 Mbps)
>
> This patch gives the following reductions in performance in the same
> testing:
>
> * RZ/G2UL:
> * UDP TX: -7.5% bandwidth (594Mbps -> 549Mbps)
>
> * RZ/G3S:
> * UDP TX: -5% bandwidth (625Mbps -> 594Mbps)
>
> These losses are considered acceptable given the benefits shown above.
> If UDP TX bandwidth must be maximised for a particular use case, NAPI
> threaded mode can be disabled at runtime via sysfs writes.
>
> The improvement of UDP RX bandwidth for the single core SoCs (RZ/G2UL &
> RZ/G3S) is particularly critical.
>
> Signed-off-by: Paul Barker <paul.barker.ct@bp.renesas.com>

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

[...]

MBR, Sergey

\
 
 \ /
  Last update: 2024-05-27 16:47    [W:0.029 / U:0.408 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site