On Tue, 2015-03-17 at 02:53 +0100, Mike Galbraith wrote: > On Mon, 2015-03-16 at 21:24 +0100, Sebastian Andrzej Siewior wrote: > > What you do is that you accept the fact that the timer-softirq is > > scheduled for no reason and then you try to disable the tick from within > > the timer-softirq. I assumed that it would work get the "expired timer" > > somehow. > > Yup, it works around that otherwise crippling wakeup. If I re-apply.. > > timers-do-not-raise-softirq-unconditionally.patch > > ..the workaround is not needed of course, but the livelock fix still is. > I haven't yet tested that in 3.18-rt though, only 4.0-rt, but I presume > it'll be the same deal there when I do. Did that, and it is. Fire up tbench 4 + make -j4 on my i7-4790+smt box booted nohz_full=2,3,6,7, death spiral begins shortly thereafter. -Mike -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
