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@xxxxxxxxxxxxxx> Reviewed-by: Sergey Shtylyov <s.shtylyov@xxxxxx> [...] MBR, Sergey
