linux-kernel - Re: [PATCH net-next] net: xilinx: axienet: Implement BQL

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Message-ID: <7446c987-3286-4b8a-a105-96443275d4d4@linux.dev>
Date: Tue, 18 Feb 2025 11:18:12 -0500
From: Sean Anderson <sean.anderson@...ux.dev>
To: Andrew Lunn <andrew@...n.ch>
Cc: "Gupta, Suraj" <Suraj.Gupta2@....com>,
 "Pandey, Radhey Shyam" <radhey.shyam.pandey@....com>,
 "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 Paolo Abeni <pabeni@...hat.com>, "David S . Miller" <davem@...emloft.net>,
 Jakub Kicinski <kuba@...nel.org>, "Simek, Michal" <michal.simek@....com>,
 "linux-arm-kernel@...ts.infradead.org"
 <linux-arm-kernel@...ts.infradead.org>, Eric Dumazet <edumazet@...gle.com>,
 Andrew Lunn <andrew+netdev@...n.ch>
Subject: Re: [PATCH net-next] net: xilinx: axienet: Implement BQL

On 2/18/25 11:16, Andrew Lunn wrote:
>> > Could you please check if BQL can be implemented for DMAengine flow?
>> 
>> I can have a look, but TBH I do not test the dma engine configuration since it is
>> so much slower.
> 
> It might actually benefit more from BQL if it is slower?

Actually, it will benefit less. The hardware is the same, so the
slowdown is entirely due to extra CPU overhead. From the CPU's
perspective, the queues actually drain faster than normal.

--Sean