Messages in this thread | | | Date | Tue, 04 Dec 2012 13:22:27 -0500 (EST) | Subject | Re: [PATCH] net/macb: increase RX buffer size for GEM | From | David Miller <> |
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From: Nicolas Ferre <nicolas.ferre@atmel.com> 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@atmel.com>
This looks like it will waste a couple hundred bytes for 1500 MTU frames, am I right?
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