From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vlad Yasevich Subject: Re: TUN device performance regression Date: Mon, 14 Apr 2014 09:54:38 -0400 Message-ID: <534BE89E.70704@gmail.com> References: <1397475118.11864.5.camel@interceptor.in.smoula.net> <1397475759.12568.0.camel@interceptor.in.smoula.net> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit To: Martin Filip , netdev@vger.kernel.org Return-path: Received: from mail-qc0-f177.google.com ([209.85.216.177]:41577 "EHLO mail-qc0-f177.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754930AbaDNNym (ORCPT ); Mon, 14 Apr 2014 09:54:42 -0400 Received: by mail-qc0-f177.google.com with SMTP id w7so8718657qcr.8 for ; Mon, 14 Apr 2014 06:54:41 -0700 (PDT) In-Reply-To: <1397475759.12568.0.camel@interceptor.in.smoula.net> Sender: netdev-owner@vger.kernel.org List-ID: 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