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

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Message-ID: <CA+BoTQmU4VXw7yD9bLAvrr6mqSbkYcNHZ1o-CcLUtb+kbQa7DQ@mail.gmail.com>
Date:	Fri, 6 Feb 2015 10:57:59 +0100
From:	Michal Kazior <michal.kazior@...to.com>
To:	Dave Taht <dave.taht@...il.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Neal Cardwell <ncardwell@...gle.com>,
	Eyal Perry <eyalpe@....mellanox.co.il>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	linux-wireless <linux-wireless@...r.kernel.org>
Subject: Re: Throughput regression with `tcp: refine TSO autosizing`

On 5 February 2015 at 20:50, Dave Taht <dave.taht@...il.com> 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
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