netdev - Re: BUG: Mellanox crash with iommu=soft and swiotlb=force

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Date:	Tue, 29 Sep 2015 09:04:14 +0200
From:	Christoffer Dall <christoffer.dall@...aro.org>
To:	Or Gerlitz <gerlitz.or@...il.com>
Cc:	Linux Netdev List <netdev@...r.kernel.org>,
	ian.campbell@...rix.com, stefano.stabellini@...citrix.com,
	konrad.wilk@...cle.com, Eugenia Emantayev <eugenia@...lanox.com>,
	Yevgeny Petrilin <yevgenyp@...lanox.com>
Subject: Re: BUG: Mellanox crash with iommu=soft and swiotlb=force

On Tue, Sep 29, 2015 at 12:59:35AM +0300, Or Gerlitz wrote:
> On Tue, Sep 29, 2015 at 12:04 AM, Christoffer Dall
> <christoffer.dall@...aro.org> 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
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