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

From: Christoffer Dall <[email-masked]>
Date: Sun, 11 Oct 2015 15:59:59 +0200

Hi,

On Tue, Sep 29, 2015 at 12:59:35AM +0300, Or Gerlitz wrote:
> On Tue, Sep 29, 2015 at 12:04 AM, Christoffer Dall
> <[email-masked]> 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.
> 
Friendly reminder on this one.  Did anyone have a look?

Thanks,
-Christoffer