[openib-general] [PATCH/RFC] IB/ipoib: add selective tx signaling

[Michael S. Tsirkin]

> > Thinking about this more - why does this patch help some benchmarks?
> > The amount of work it takes for the hardware to generate a completion
> > is likely negligeable, and we still are scanning the same amount
> > of TX WRs in a loop to unmap/free them.
> 
> This makes sense but I think you should also consider the fact that 
> the tx_lock is taken once per per tx_completion so, with the patch,
> the driver spends less time under lock.

Try removing tx_lock from completion path just for the fun of it.
I think you'll find it gains you 5% tops.

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MST