netdev - Re: [PATCH net-next 3/8] cadence: macb: Add page pool support handle multi-descriptor frame rx

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Message-ID: <87o6mgeyn7.fsf@redhat.com>
Date: Tue, 27 Jan 2026 00:34:52 +0100
From: Paolo Valerio <pvalerio@...hat.com>
To: Andrew Lunn <andrew@...n.ch>
Cc: netdev@...r.kernel.org, Nicolas Ferre <nicolas.ferre@...rochip.com>,
 Claudiu Beznea <claudiu.beznea@...on.dev>, 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>, Lorenzo Bianconi <lorenzo@...nel.org>,
 Théo Lebrun <theo.lebrun@...tlin.com>
Subject: Re: [PATCH net-next 3/8] cadence: macb: Add page pool support
 handle multi-descriptor frame rx

On 26 Jan 2026 at 03:29:46 PM, Andrew Lunn <andrew@...n.ch> wrote:

>> > I was more interested in plain networking, not XDP. Does it perform
>> > better with page pool? You at least need to show it is not worse, you
>> > need to avoid performance regressions.
>> >
>> 
>> I retested with iperf3. The target has a single rx queue with iperf3
>> running with no cpu affinity set.
>> 
>> |              |  64 | 128 |
>> | baseline     | 273 | 545 |
>> | pp (page)    | 273 | 544 |
>> | pp (2 frags) | 272 | 544 |
>
> So no real difference. That is unusual, it is typically faster, or if
> it is always doing line rate, it uses less CPU time. That might
> suggest the page pool integration is not optimal?
>

Thanks Andrew,

I can't tell, but the same numbers were a little surprising to me as well.
I'll spend some more time on this on my hw.