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Date:	Sun, 04 Oct 2015 10:28:25 -0700
From:	Eric Dumazet <>
To:	Ben Greear <>
Cc:	Neal Cardwell <>,
	netdev <>,
	ath10k <>,
	Eric Dumazet <>
Subject: Re: Slow ramp-up for single-stream TCP throughput on 4.2 kernel.

On Sun, 2015-10-04 at 10:05 -0700, Ben Greear wrote:

> I guess I'll just stop using Cubic.  Any suggestions for another
> congestion algorithm to use?  I'd prefer something that worked well
> in pretty much any network condition, of course, and it has to work with
> ath10k.
> We can also run some tests with 1G, 10G, ath10k, ath9k, and in conjunction
> with network emulators and various congestion control algorithms.

You could use cubic , but disable or tune HyStart, which is known to be
problematic anyway.

echo  0 >/sys/module/tcp_cubic/parameters/hystart_detect

Or try

echo 40 >/sys/module/tcp_cubic/parameters/hystart_low_window

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