netdev - Re: TCP reaching to maximum throughput after a long time

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Message-ID: <570D566B.8050302@candelatech.com>
Date:	Tue, 12 Apr 2016 13:11:23 -0700
From:	Ben Greear <greearb@...delatech.com>
To:	"Machani, Yaniv" <yanivma@...com>, netdev <netdev@...r.kernel.org>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Neal Cardwell <ncardwell@...gle.com>,
	Yuchung Cheng <ycheng@...gle.com>,
	Nandita Dukkipati <nanditad@...gle.com>,
	open list <linux-kernel@...r.kernel.org>,
	"Kama, Meirav" <meiravk@...com>
Subject: Re: TCP reaching to maximum throughput after a long time

On 04/12/2016 12:31 PM, Machani, Yaniv wrote:
> On Tue, Apr 12, 2016 at 18:04:52, Ben Greear wrote:
>> On 04/12/2016 07:52 AM, Eric Dumazet wrote:
>>> On Tue, 2016-04-12 at 12:17 +0000, Machani, Yaniv wrote:
>>>>
>>
>> If you are using 'Cubic' TCP congestion control, then please try
>> something different.
>> It was broken last I checked, at least when used with the ath10k driver.
>>
>
> Thanks Ben, this indeed seems to be the issue !
> Switching to reno got me to max throughput instantly.
>
> I'm still looking through the thread you have shared, but from what I understand there is no planned fix for it ?

I think at the time it was blamed on ath10k and no one cared to try to fix it.

Or, maybe no one really uses CUBIC anymore?

Either way, I have no plans to try to fix CUBIC, but maybe someone who knows
this code better could give it a try.

Thanks,
Ben


-- 
Ben Greear <greearb@...delatech.com>
Candela Technologies Inc  http://www.candelatech.com