> > > Currently we actively use 2 of them. First for TX command second for > > > actual frame. It would be even worth if we need to expand > > > each packet also for TX command. > > > > We will no longer do that after davem and I figure out those allocation > > patches. > > Not sure these things are connected. TX command is allocated fixed for each TFD. Ah, no, I misread that. Well, I think it might still help to say you need N bytes headroom and use those since you wouldn't have to allocate an extra skb. > > You should implement TCP checksumming in the hardware. *that* would help > > a lot. > > There is already pretty much deal of link layer in software to reduce > the cost and the complexity of the HW for these softmac NICs so > this would be kind of strange investment...but I didn't invest much > thoughts into yet. > There are probably other means to utilize scatter gather DMA then TCP > off loading. Are they any other source of scattered packets maybe > iovec? Well as far as I know those too would be zero-copy IO which only works if you have TCP checksumming in hardware. johannes
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