netdev - Re: Slow speed of tcp connections in a network namespace

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Message-ID: <20121229211938.GC4350@paralelels.com>
Date:	Sun, 30 Dec 2012 01:19:39 +0400
From:	Andrew Vagin <avagin@...allels.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	<netdev@...r.kernel.org>, <vvs@...allels.com>,
	Michał Mirosław <mirq-linux@...e.qmqm.pl>
Subject: Re: Slow speed of tcp connections in a network namespace

On Sat, Dec 29, 2012 at 01:12:26PM -0800, Eric Dumazet wrote:
> On Sun, 2012-12-30 at 00:08 +0400, Andrew Vagin wrote:
> 
> > Is it right, that a received window will be less, if packets are not sorted?
> > Looks like a bug.
> 
> Not really a bug.
> 
> TCP is very sensitive to packet reorders. I wont elaborate here as
> its a bit off topic.
> 
> Try to reorders credits/debits on your bank account, I am pretty sure
> you'll lose some money or even get serious troubles.
> 
> Of course, enabling GRO on eth0 would definitely help a bit...
> 
> (once/iff veth driver features are fixed to allow GSO packets being
> forwarded without being segmented again)
> 

Eric, thank you for the help.
I need time for thinking. I will ask you, if new questions will appear.

> 
> 
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