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Date: Tue, 21 Nov 2023 02:00:25 +0000
To: Vishvambar Panth S <>
Subject: Re: [PATCH net-next] net: microchip: lan743x : bidirectional throughput


This patch was applied to netdev/net-next.git (main)
by Jakub Kicinski <>:

On Thu, 16 Nov 2023 11:13:50 +0530 you wrote:
> The LAN743x/PCI11xxx DMA descriptors are always 4 dwords long, but the
> device supports placing the descriptors in memory back to back or
> reserving space in between them using its DMA_DESCRIPTOR_SPACE (DSPACE)
> configurable hardware setting. Currently DSPACE is unnecessarily set to
> match the host's L1 cache line size, resulting in space reserved in
> between descriptors in most platforms and causing a suboptimal behavior
> (single PCIe Mem transaction per descriptor). By changing the setting
> to DSPACE=16 many descriptors can be packed in a single PCIe Mem
> transaction resulting in a massive performance improvement in
> bidirectional tests without any negative effects.
> Tested and verified improvements on x64 PC and several ARM platforms
> (typical data below)
> [...]

Here is the summary with links:
  - [net-next] net: microchip: lan743x : bidirectional throughput improvement

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