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

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Date:	Tue, 12 Apr 2016 13:29:59 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ben Greear <greearb@...delatech.com>
Cc:	"Machani, Yaniv" <yanivma@...com>, netdev <netdev@...r.kernel.org>,
	"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 Tue, 2016-04-12 at 13:23 -0700, Ben Greear wrote:

> It worked well enough for years that I didn't even know other algorithms were
> available.  It was broken around 4.0 time, and I reported it to the list,
> and no one seemed to really care enough to do anything about it.  I changed
> to reno and ignored the problem as well.
> 
> It is trivially easy to see the regression when using ath10k NIC, and from this email
> thread, I guess other NICs have similar issues.

Since it is so trivial, why don't you start a bisection ?

I asked a capture, I did not say ' switch to Reno or whatever ', right ?

Guessing is nice, but investigating and fixing is better.

Do not assume that nothing can be done, please ?

Thanks.