linux-kernel - Re: [PATCH v2] net: ethernet: mtk_ppe: Change PPE entries number to 16K

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Message-ID:
 <TY3P286MB261180E580D838704E6123B598DE2@TY3P286MB2611.JPNP286.PROD.OUTLOOK.COM>
Date: Thu, 4 Jul 2024 19:06:29 +0800
From: Shengyu Qu <wiagn233@...look.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: wiagn233@...look.com, nbd@....name, sean.wang@...iatek.com,
 Mark-MC.Lee@...iatek.com, lorenzo@...nel.org, davem@...emloft.net,
 edumazet@...gle.com, pabeni@...hat.com, matthias.bgg@...il.com,
 angelogioacchino.delregno@...labora.com, pablo@...filter.org,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org,
 stable@...r.kernel.org, Elad Yifee <eladwf@...il.com>
Subject: Re: [PATCH v2] net: ethernet: mtk_ppe: Change PPE entries number to
 16K

Hi,

PCDN means P2P CDN[1]; This modification already exists in a heavily
modified openwrt fork here[2] for over 2 years so it should be working
with to regression. Although a higher limit would be better for PCDN use
case, but only newer devices like MT7986 supports 32768 max entries.
Setting to 16384 would keep old devices working.

[1] https://www.w3.org/wiki/Networks/P2P_CDN
[2] https://github.com/coolsnowwolf/lede/blob/2ef8b6a6142798b5e58501fe12ffd10b0961947f/target/linux/ramips/files/drivers/net/ethernet/mtk/mtk_hnat/hnat.h#L604

在 2024/7/4 7:48, Jakub Kicinski 写道:
> On Thu, 4 Jul 2024 01:38:50 +0800 Shengyu Qu wrote:
>> BT download and PCDN would create tons of connections, and might be
>> easily to reach the 8192 limit, one of my friend sees 50000+ links when
>> hosting PCDN.
> 
> I don't know what PCDN is, but what we care about in Linux is whether
> the change under Fixes introduced a regression. Optimizations, and 
> improvements no matter how trivial in terms of code are not fixes.
> So did ba37b7caf1ed ("net: ethernet: mtk_eth_soc: add support for
> initializing the PPE") make things worse. And if you're saying there
> are 50k "links" in real world why is 16k a major win? it's 1/3rd of
> the total.