[PATCH] ath10k: Make HTT fill size configurable

[Sujith Manoharan]

Michal Kazior wrote:
> I don't think this should be adjustable.

Why ?

> I assume you tested this in conjunction with rx batching patch - what
> fill level values did you use to see throughput improvement? How
> (un)responsive was serial/ssh connection to the machine?

Any value north of 128 made the console unresponsive, with
the CPU maxed out. But 16 appears to be rather low ? Performance
numbers are low and we end up with lots of replenish tasklets.

But - the internal driver somehow manages to keep CPU usage
down at a fill level of *1000*.

I think for ath10k, the default could stay the same on low end MIPS boards
like AP135, but on slightly more powerful boards like AP148 with dual-core
ARM processors, performance can be boosted by increasing the fill level
while still keeping responsiveness at a reasonable level.

> I have a patch internally which removes the replenishment tasklet and
> I wonder how will it behave with rx batching then, hmm..

I tried that earlier and could see only marginal improvement. The biggest
increase came when I replaced netif_receive_skb() with netif_rx()
in mac80211/rx.c.

Sujith