Re: Throughput regression with `tcp: refine TSO autosizing`

On 5 February 2015 at 20:50, Dave Taht [off-list ref] wrote:
[...]

And I really, really, really wish, that just once during this thread,
someone had bothered to try running a test
at a real world MCS rate - say MCS1, or MCS4, and measured the latency
under load of that...

Time between frame submission to firmware and tx-completion on one of
my ath10k machines:

Legacy 54mbps: ~18ms
Legacy 6mbps: ~37ms
11n MCS 3 (nss=0): ~13ms
11n MCS 8 (nss=1): ~6-8ms
11ac NSS=1 MCS=2: ~4-6ms
11ac NSS=2 MCS=0: ~5-8ms

Keep in mind this is a clean room environment so retransmissions are
kept at minimum. Obviously with a noisy environment you'll get retries
at different rates and higher latency.


Michał