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

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Date:	Sun, 4 Oct 2015 12:33:04 -0700
From:	Yuchung Cheng <ycheng@...gle.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Ben Greear <greearb@...delatech.com>,
	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, Oct 4, 2015 at 10:28 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> 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
Or if you truly don't want to use cubic, Reno would be my choice b/c
1) Cubic in mid-low BDP behaves like Reno (tcp friendly mode)
2) Reno has several recent stretched-ack fixes which may be useful in wireless

>
>
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