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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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)



--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html