On Sun, May 12, 2013 at 10:17:49AM +0200, Mike Galbraith wrote: > Greetings, > > Turning on new NO_HZ feature on my Q6600 box in master, I see that tasks > accrue zero utime/stime. However, the same exact kernel on E5620 box > works fine, so it would appear there's a CPU dependency somewhere.
Ah indeed, I just managed to reproduce the same issue. > > Is core2 expected to go dysfunctional with context tracking enabled? > CONFIG_VIRT_CPU_ACCOUNTING alone works fine in 3.9-stable, turn on > CONFIG_CONTEXT_TRACKING_FORCE, and CPU accounting stops working on core2 > boxen only, same exact kernel continues to work just fine on E5620 > (Westmere) box. There was no known issue with core2. The box where I'm seeing the it is a Phenom quad core that had NR_CPUS=2. May be the issue is more likely to happen with this low number. I don't know. I'm investigating further. Thanks. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
