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

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Message-ID: <1423660672.4847.15.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Wed, 11 Feb 2015 05:17:52 -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 Wed, 2015-02-11 at 09:33 +0100, Michal Kazior wrote:

> If I set tcp_limit_output_bytes to 700K+ I can get ath10k w/ cushion
> w/ aggregation to reach 600mbps on a single flow.

You know, there is a reason this sysctl exists in the first place ;)

The first suggestion I made to you was to raise it.

The default setting must stay as is as long default Qdisc is pfifo_fast.

I believe I already mentioned skb->truesize tricks for drivers willing
to adjust the TSQ given their constraints.


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