From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoffer Dall Subject: Re: BUG: Mellanox crash with iommu=soft and swiotlb=force Date: Tue, 29 Sep 2015 09:04:14 +0200 Message-ID: <20150929070414.GA9002@cbox> References: <20150928210450.GA7610@cbox> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Linux Netdev List , ian.campbell@citrix.com, stefano.stabellini@eu.citrix.com, konrad.wilk@oracle.com, Eugenia Emantayev , Yevgeny Petrilin To: Or Gerlitz Return-path: Received: from mail-la0-f48.google.com ([209.85.215.48]:36748 "EHLO mail-la0-f48.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932423AbbI2HEP (ORCPT ); Tue, 29 Sep 2015 03:04:15 -0400 Received: by laclj5 with SMTP id lj5so91714880lac.3 for ; Tue, 29 Sep 2015 00:04:13 -0700 (PDT) Content-Disposition: inline In-Reply-To: Sender: netdev-owner@vger.kernel.org List-ID: On Tue, Sep 29, 2015 at 12:59:35AM +0300, Or Gerlitz wrote: > On Tue, Sep 29, 2015 at 12:04 AM, Christoffer Dall > wrote: > > Hi, > > > > In doing some performance experiments I found that using a 10G Mellanox > > MX354A Dual port FDR CX3 device on a server running Apache and running > > ab against that server causes the system to crash with 'iommu=soft > > swiotlb=force'. The same behavior is seen without these options on Dom0 > > running under Xen. > > > > I have tried this on v4.0 and v4.3-rc3. > > Woops, needs looking indeed. Unfortunately many people in the team are > off for the Sukkot holiday with real backing to business coming to > play on Oct 6th -- not sure we can really respond on that before. > > Are you running over ARM? which? if not, is that x86 64bit? > I'm running on x86_64. Thanks, -Christoffer