Re: [PATCH] net/macb: increase RX buffer size for GEM
From: David Miller
Date: Tue Dec 04 2012 - 13:22:25 EST
From: Nicolas Ferre <nicolas.ferre@xxxxxxxxx>
Date: Mon, 3 Dec 2012 13:15:43 +0100
> Macb Ethernet controller requires a RX buffer of 128 bytes. It is
> highly sub-optimal for Gigabit-capable GEM that is able to use
> a bigger DMA buffer. Change this constant and associated macros
> with data stored in the private structure.
> I also kept the result of buffers per page calculation to lower the
> impact of this move to a variable rx buffer size on rx hot path.
> RX DMA buffer size has to be multiple of 64 bytes as indicated in
> DMA Configuration Register specification.
> Signed-off-by: Nicolas Ferre <nicolas.ferre@xxxxxxxxx>
This looks like it will waste a couple hundred bytes for 1500 MTU
frames, am I right?
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