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

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Message-ID: <1356815546.21409.5277.camel@edumazet-glaptop>
Date:	Sat, 29 Dec 2012 13:12:26 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Andrew Vagin <avagin@...allels.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 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)



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