netdev - Re: [PATCH net-next v3 2/4] net: stmmac: Set page_pool_params.max

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Message-ID: <7b6acdc1-5151-427a-ac84-a6cb666f53ca@linux.dev>
Date: Wed, 15 Jan 2025 18:07:32 +0800
From: Yanteng Si <si.yanteng@...ux.dev>
To: Furong Xu <0x1207@...il.com>, netdev@...r.kernel.org,
 linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc: Alexander Lobakin <aleksander.lobakin@...el.com>,
 Joe Damato <jdamato@...tly.com>, Andrew Lunn <andrew+netdev@...n.ch>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Maxime Coquelin <mcoquelin.stm32@...il.com>, xfr@...look.com
Subject: Re: [PATCH net-next v3 2/4] net: stmmac: Set page_pool_params.max_len
 to a precise size

在 2025/1/15 11:27, Furong Xu 写道:
> DMA engine will always write no more than dma_buf_sz bytes of a received
> frame into a page buffer, the remaining spaces are unused or used by CPU
> exclusively.
> Setting page_pool_params.max_len to almost the full size of page(s) helps
> nothing more, but wastes more CPU cycles on cache maintenance.
> 
> For a standard MTU of 1500, then dma_buf_sz is assigned to 1536, and this
> patch brings ~16.9% driver performance improvement in a TCP RX
> throughput test with iPerf tool on a single isolated Cortex-A65 CPU
> core, from 2.43 Gbits/sec increased to 2.84 Gbits/sec.
> 
> Signed-off-by: Furong Xu <0x1207@...il.com>
> Reviewed-by: Alexander Lobakin <aleksander.lobakin@...el.com>
Reviewed-by: Yanteng Si <si.yanteng@...ux.dev>

Thanks,
Yanteng

> ---
>   drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 2 +-
>   drivers/net/ethernet/stmicro/stmmac/stmmac_xdp.h  | 1 -
>   2 files changed, 1 insertion(+), 2 deletions(-)