netdev - TUN device performance regression

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Message-ID: <1397475118.11864.5.camel@interceptor.in.smoula.net>
Date:	Mon, 14 Apr 2014 13:31:58 +0200
From:	Martin Filip <nexus+kernel@...ula.net>
To:	netdev@...r.kernel.org
Subject: TUN device performance regression

Hello,

I've noticed significant TUN device performance drop between 3.13 and
3.14 kernels, problem seems to persist until current git version.

With good kernel I can achieve full 100mbps through openvpn without any
problem, with problematic kernel TX performance drops down to ~50kbps.

According to git bisect it seems that root of all evil is commit
53d6471cef17262d3ad1c7ce8982a234244f68ec.

I can confirm that performance is great again with current kernel when I
revert this one.

-- 
Martin Filip
e-mail: nexus@...ula.net
jabberID: nexus@...ula.net
http://www.smoula.net

View attachment "bisect.log" of type "text/x-log" (2995 bytes)