netdev - Re: [PATCH 1/1] net: tcp: RTO restart

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Message-ID: <CADVnQyn4Zszpc2eTg0BkJZY0+Y-LBcPHTPTjVS2o8_zZTX31jg@mail.gmail.com>
Date:	Wed, 26 Feb 2014 09:57:39 -0500
From:	Neal Cardwell <ncardwell@...gle.com>
To:	Per Hurtig <per.hurtig@....se>
Cc:	Yuchung Cheng <ycheng@...gle.com>, netdev <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Anna Brunström <anna.brunstrom@....se>,
	Andreas Petlund <apetlund@...ula.no>,
	Michael Welzl <michawe@....uio.no>,
	Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>,
	Nandita Dukkipati <nanditad@...gle.com>
Subject: Re: [PATCH 1/1] net: tcp: RTO restart

On Wed, Feb 26, 2014 at 4:50 AM, Per Hurtig <per.hurtig@....se> wrote:
> Also, as your setup includes TLP we only have the RTO restart over TLP gain to start
> with.

My gut says the next thing to try is applying the "RTO restart" idea
to the scheduling of the TLP probe (scheduling the TLP probe for
write_queue_head_skb->when + tlp_timeout). Doing an RTO earlier can be
a very bad thing, due to reseting the cwnd to 1. But doing a TLP
earlier does not have much downside, and could have significant
latency savings (though maybe Nandita already tried this at some
point)...

neal
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