netdev - Re: tcp bw in 2.6

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Message-Id: <20071002.133322.52193802.davem@davemloft.net>
Date:	Tue, 02 Oct 2007 13:33:22 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	torvalds@...ux-foundation.org
Cc:	lm@...mover.com, herbert@...dor.apana.org.au, wscott@...mover.com,
	netdev@...r.kernel.org
Subject: Re: tcp bw in 2.6

From: Linus Torvalds <torvalds@...ux-foundation.org>
Date: Tue, 2 Oct 2007 12:27:53 -0700 (PDT)

> We see a single packet containing 16060 bytes, which seems to be because 
> of TSO on the sending side (you did your tcpdump on the sender, no?), so 
> it will actually be broken up into 11 1460-byte regular frames by the 
> network card, since they started out agreeing on a standard 1460-byte MSS. 
> So the above is not a jumbo frame, it just kind of looks like one when you 
> capture it on the sender side.
> 
> And maybe a 32kB window is not big enough when it causes the networking 
> code to basically just have a single packet outstanding.

We fixed a lot of bugs in TSO last year.

It would be really great to see numbers with a more recent kernel
than 2.6.18

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