netdev - Re: [PATCH] tcp: Increase the initial congestion window to 10.

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Message-ID: <AANLkTi=Zxp3VGt266MZ+NVmSFQhtnmUxPBFV_t2hcObZ@mail.gmail.com>
Date:	Thu, 3 Feb 2011 15:54:00 -0800
From:	Yuchung Cheng <ycheng@...gle.com>
To:	Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>
Cc:	David Miller <davem@...emloft.net>,
	Netdev <netdev@...r.kernel.org>, therbert@...gle.com,
	"H.K. Jerry Chu" <hkjerry.chu@...il.com>,
	Nandita Dukkipati <nanditad@...gle.com>
Subject: Re: [PATCH] tcp: Increase the initial congestion window to 10.

On Thu, Feb 3, 2011 at 2:43 PM, Ilpo Järvinen <ilpo.jarvinen@...sinki.fi> wrote:
> It would perhaps be useful to change receiver advertized window to include
> some extra segs initially. It should be >= IW + peer's dupThresh-1 as
That's a very good point.

Maybe IRW should be IW + ssthresh - 1 since Linux also performs
limited-transmit during fast-recovery as described in RFC 3517. This
way sender can keep sending new data during the recovery as long as
cwnd allows.

> otherwise limited transmit won't work for the initial window because we
> won't open more receiver window with dupacks (IIRC, I suppose Jerry might
> be able to correct me right away if I'm wrong and we open window with
> dupacks too?).  I think initial receiver window code used to have some
> surplus but it was broken by the rfc3390-func conversion (against my
> advice on how to do the conversion).
>
> --
>  i.
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