linux-kernel - Re: nouveau. swiotlb: coherent allocation failed for device 0000:01:00.0 size=2097152

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Date:   Mon, 18 Dec 2017 20:12:12 +0100
From:   Mike Galbraith <efault@....de>
To:     Tobias Klausmann <tobias.johannes.klausmann@....thm.de>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     Ben Skeggs <bskeggs@...hat.com>,
        nouveau <nouveau@...ts.freedesktop.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: nouveau. swiotlb: coherent allocation failed for device
 0000:01:00.0 size=2097152

On Mon, 2017-12-18 at 20:01 +0100, Tobias Klausmann wrote:
> On 12/18/17 7:06 PM, Mike Galbraith wrote:
> > Greetings,
> >
> > Kernel bound workloads seem to trigger the below for whatever reason.
> >   I only see this when beating up NFS.  There was a kworker wakeup
> > latency issue, but with a bandaid applied to fix that up, I can still
> > trigger this.
> 
> 
> Hi,
> 
> i have seen this one as well with my system, but i could not find an 
> easy way to trigger it for bisecting purpose. If you can trigger it 
> conveniently, a bisect would be nice!

Workload permitting.  To reproduce, mount your box NFS, cd to somewhere
the NFS mount, and just do bonnie -s <memory size>.  There, maybe
you'll beat me to it.  I hope so, I have multiple kernels doing the
annoying "baby birds in a nest" thing at me literally endlessly :)

	-Mike