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

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Message-ID: <1423574079.28434.21.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Tue, 10 Feb 2015 05:14:39 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Michal Kazior <michal.kazior@...to.com>
Cc:	Neal Cardwell <ncardwell@...gle.com>,
	linux-wireless <linux-wireless@...r.kernel.org>,
	Network Development <netdev@...r.kernel.org>,
	Eyal Perry <eyalpe@....mellanox.co.il>
Subject: Re: Throughput regression with `tcp: refine TSO autosizing`

On Tue, 2015-02-10 at 11:33 +0100, Michal Kazior wrote:
>                            ath10k_core_napi_dummy_poll, 64);
> +       ewma_init(&ar->tx_delay_us, 16384, 8);


1) 16384 factor might be too big.

2) a weight of 8 seems too low given aggregation values used in wifi.

On 32bit arches, the max range for ewma value would be 262144 usec,
a quarter of a second...

You could use a factor of 64 instead, and a weight of 16.


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