netdev - Re: 16% regression on 10G caused by TCP small queues

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Message-ID: <CAOaVG15indAxBz7E-T+9MK03indiXBa0UhQZ5j6K5DxYP44Mxg@mail.gmail.com>
Date:	Wed, 23 Oct 2013 20:09:49 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Neal Cardwell <ncardwell@...gle.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	David Miller <davem@...emloft.net>,
	Dave Täht <dave.taht@...ferbloat.net>,
	Netdev <netdev@...r.kernel.org>
Subject: Re: 16% regression on 10G caused by TCP small queues

On Wed, Oct 23, 2013 at 7:37 PM, Neal Cardwell <ncardwell@...gle.com> wrote:
> On Wed, Oct 23, 2013 at 10:29 PM, Stephen Hemminger
> <stephen@...workplumber.org> wrote:
>> In the course of testing routing functionality, I discovered a that the single flow TCP
>> throughput was much worse than expected. At first, it looked like a router problem,
>> or maybe because one end was a FreeBSD system (which has noticeably slower TCP performance).
>> But reducing it down to two systems directly connected over 10G (ixgbe) found the problem.
> ...
>>   4. Do something smarter like a dynamic TCP small queue that adapts.
>
> Yep, Eric made TSQ dynamic a few weeks ago, and mentioned that his
> commit helps a single flow on 10Gbps link:
>
> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c9eeec26e32e087359160406f96e0949b3cc6f10
>
> Can you please check the performance in your setup on 3.12-rc4 or newer? :-)
>
> Thanks!
>
> neal

I will check 3.12, but what about users on 3.10 which is the LTS
kernel used by most distros?
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