netdev - Re: TUN device performance regression

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Date:	Mon, 14 Apr 2014 09:54:38 -0400
From:	Vlad Yasevich <vyasevich@...il.com>
To:	Martin Filip <nexus+kernel@...ula.net>, netdev@...r.kernel.org
Subject: Re: TUN device performance regression

On 04/14/2014 07:42 AM, Martin Filip wrote:
>> 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.
>>
> I've forgot to mention kernel bug:
> https://bugzilla.kernel.org/show_bug.cgi?id=74051
> 

Thanks for the report.  I am taking a look.

-vlad
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