netdev - Re: Slow ramp-up for single-stream TCP throughput on 4.2 kernel.

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Message-ID: <1443979705.32531.71.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Sun, 04 Oct 2015 10:28:25 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ben Greear <greearb@...delatech.com>
Cc:	Neal Cardwell <ncardwell@...gle.com>,
	netdev <netdev@...r.kernel.org>,
	ath10k <ath10k@...ts.infradead.org>,
	Eric Dumazet <edumazet@...gle.com>
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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