Re: [RFC PATCH] fix problems with NETIF_F_HIGHDMA in networkingdrivers

[David Miller]

From: FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx>
Date: Sun, 28 Feb 2010 03:38:19 +0900

> When I proposed such approach (always use swiotlb) before, IIRC,
> the objections were:
> 
> - better to make allocation respect dma_mask. (I don't think that this
>   approach is possible since we don't know which device handles data
>   later when we allocate memory).

And such objects might end up being processed by multiple devices with
different DMA restrictions.

> - swiotlb is not good for small systems since it allocates too much
>   memory (we can fix this though).

Indeed.
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