> > On Mon, 17 Jul 2017, Liang, Kan wrote: > > There are three proposed patches so far. > > Patch 1: The patch as above which speed up the hrtimer. > > Patch 2: Thomas's first proposal. > > https://patchwork.kernel.org/patch/9803033/ > > https://patchwork.kernel.org/patch/9805903/ > > Patch 3: my original proposal which increase the NMI watchdog timeout > > by 3X https://patchwork.kernel.org/patch/9802053/ > > > > According to our test, only patch 3 works well. > > The other two patches will hang the system eventually. > > For patch 1, the system hang after running our test case for ~1 hour. > > For patch 2, the system hang in running the overnight test. > > There is no error message shown when the system hang. So I don't know > > the root cause yet. > > That doesn't make sense. What's the exact test procedure? I don't know the exact test procedure. The test case is from our customer. I only know that the test case makes calls into the x11 libs. > > > BTW: We set 1 to watchdog_thresh when we did the test. > > It's believed that can speed up the failure. > > Believe is not really a technical measure.... > 1 is a valid value for watchdog_thresh. It was set through the standard proc interface. /proc/sys/kernel/watchdog_thresh It should not impacts the final test result. Thanks, Kan