netdev - Re: using software TSO on non-TSO capable netdevices

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Message-Id: <20080731.031654.44296685.davem@davemloft.net>
Date:	Thu, 31 Jul 2008 03:16:54 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	buytenh@...tstofly.org
Cc:	herbert@...dor.apana.org.au, netdev@...r.kernel.org,
	akarkare@...vell.com, nico@....org
Subject: Re: using software TSO on non-TSO capable netdevices

From: Lennert Buytenhek <buytenh@...tstofly.org>
Date: Thu, 31 Jul 2008 12:14:25 +0200

> As to the congestion window, I had the idea that it's not increasing
> beyond ~2-3 because the RTT is so low so it doesn't need much data
> to fill the pipe, but I'm not a TCP expert.

Local network 10GB needs a pretty decent congestion window.

Well, it needs to be at least as big as the largest amount of
non-retransmitted data in-flight, and you've stated here that
the receive has grown it's window to 700K.
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