Messages in this thread | | | Subject | Re: Large increase in context switch rate | From | Andi Kleen <> | Date | Thu, 17 Jul 2008 23:43:24 +0200 |
| |
Jeremy Fitzhardinge <jeremy@goop.org> writes: > > OK, but that still doesn't account for the relatively large increase > from 2.6.18 -> 2.6.26. You're using HZ=100 in both cases, I presume. > > The other variable is NOHZ and highres timers. You could try turning > those off in 2.6.26. Also, CONFIG_PREEMPT could well make a > difference. 2.6.18-xen doesn't support CONFIG_PREEMPT at all, but > pvops(-xen) does.
If it's that easily reproducible you could just bisect it?
-Andi
| |