On 12/04/17 15:31, Peter Zijlstra wrote:
On Wed, Apr 12, 2017 at 12:04:00PM +0000, Lofstedt, Marta wrote:
Hi,
We have this "old" Lenovo Cantiga laptop(Intel Core 2 Duo L9400), hocked up to our i915 pre-merge CI system, that has started to give unstable results after commit:
commit 7b09cc5a9debc86c903c2eff8f8a1fdef773c649
Author: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx>
Date: Wed Mar 22 16:24:17 2017 -0400
sched/clock: Fix broken stable to unstable transfer
The issue is describe more in detail here:
https://bugs.freedesktop.org/show_bug.cgi?id=100548
I don't click links.
We have reverted above patch and then issue is no longer reproducible.
Also, note that this issue has not been reproduced on any of our other machines,
https://intel-gfx-ci.01.org/CI/
So, why is this only affecting the Core 2 Duo?
Core2 doesn't have a usable TSC and would revert to the slow path. I'll
have another look at that patch.
So, by default, it is using the hpet clock source. FYI, I tried the only
other available clock source (acpi_pm) and got the same result.
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