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

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Date:	Tue, 29 Sep 2015 00:59:35 +0300
From:	Or Gerlitz <gerlitz.or@...il.com>
To:	Christoffer Dall <christoffer.dall@...aro.org>
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 12:04 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?

Or.

> Examples of crashes:
> http://pastebin.ubuntu.com/11953498/
> http://pastebin.ubuntu.com/11953443/
>
> Kernel config (v4.3):
> http://paste.ubuntu.com/12605446/
>
> To reproduce, host a file in apache server on a system with the Mellanox
> NIC (I used the 41K index file of the GCC manual) and run ab (apache
> bench) from a client machine, something like this:
>
> $ ab -n 100000 -c 100 http://10.10.1.2/gcc/index.html
>
> I'm afraid debugging this is out of my area of expertise.  Is this
> something you could have a look at?
>
>
> Thanks,
> -Christoffer
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