drm i915 hangs on heavy io load

Chris Wilson chris at chris-wilson.co.uk
Tue Oct 30 03:02:18 PDT 2012

On Tue, 30 Oct 2012 09:39:43 +0900, Norbert Preining <preining at logic.at> wrote:
> Hi Chris,
> On So, 28 Okt 2012, Chris Wilson wrote:
> > Yeah, looks like we have another issue to contend with, so can you
> > please file a bug on bugzilla.freedesktop.org (or bugzilla.kernel.org)
> > so that we don't lose track of it.
> I have seen this here:
> 	https://bugs.freedesktop.org/show_bug.cgi?id=55984
> does it make sense to start a new bug for that?

I was fearing it was something different, but since Dave has now found
that rc6=0 was not sufficient in his case, it is probably the same. The
issue surrounding cpu-relocs was never explained and I suspect that we
are still being bitten by that root cause. Along those lines:

commit 86a1ee26bb60e1ab8984e92f0e9186c354670aed
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Sat Aug 11 15:41:04 2012 +0100

    drm/i915: Only pwrite through the GTT if there is space in the aperture

is the most contentious patch in 3.7-rc.

Chris Wilson, Intel Open Source Technology Centre

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