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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. MichaĆ -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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