netdev - Re: low vxlan throughput with tso enabled

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]

Message-ID: <CA+mtBx-7Q1O8KMgmcoKnHurj7DP-4jugkKuqt3b=XaMga2-NEg@mail.gmail.com>
Date:	Tue, 3 Feb 2015 08:26:27 -0800
From:	Tom Herbert <therbert@...gle.com>
To:	Reiner Herrmann <reiner.herrmann@...hos.com>
Cc:	Linux Netdev List <netdev@...r.kernel.org>, svens@...ckframe.org,
	Vittorio Curcio <Vittorio.Curcio@...hos.com>
Subject: Re: low vxlan throughput with tso enabled

On Tue, Feb 3, 2015 at 7:50 AM, Reiner Herrmann
<reiner.herrmann@...hos.com> wrote:
> Hi!
>
> I have a vxlan tunnel established between two network interfaces, which
> both have a MTU of 1500. The vxlan interfaces have the same MTU.
> With TSO enabled, I observe low throughput with TCP connections (<100 kB/s).
> Disabling TSO works around this issue and throughput is as expected.
> Can someone please explain how TSO is influencing the tunnel to cause
> such a difference?
>
Please provide more information. What NIC? What is the link rate? What
are you running to test. Also report 'ethtool -k' of both tunnel and
Ethernet interfaces, and tcpdump on the interfaces (to see GSO
packets).

Thanks

> Kind regards,
> Reiner
>
> --
> 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
--
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