How does the Kernel decide which Umem frame to choose for the next packet?

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Subject: How does the Kernel decide which Umem frame to choose for the next packet?
From: "Gaul, Maximilian" <maximilian.gaul@xxxxxx>
Date: Mon, 18 May 2020 08:37:09 +0000
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Thread-topic: How does the Kernel decide which Umem frame to choose for the next packet?

Hello,

I read through the paper "The Path to DPDK Speeds for AF XDP" but I couldn't find information about how the Kernel choses the Umem frame for the next packet? Or in case of zero-copy, how the driver decides which Umem frame to chose.
But maybe I just overlooked it.

So how does this work?

Best regards

Max

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