Ingo Molnar wrote on Thursday, March 31, 2005 6:15 AM > is there any idle time on the system, in steady state (it's a sign of > under-balancing)? Idle balancing (and wakeup balancing) is one of the > things that got tuned back and forth alot. Also, do you know what the > total number of context-switches is during the full test on each kernel? > Too many context-switches can be an indicator of over-balancing. Another > sign of migration gone bad can be relative increase of userspace time > vs. system time. (due to cache trashing, on DB workloads, where most of > the cache contents are userspace's.)
No, there are no idle time on the system. If system become I/O bound, we would do everything we can to remove that bottleneck, i.e., throw a couple hundred GB of memory to the system, or add a couple hundred disk drives, etc. Believe it or not, we are currently CPU bound and that's the reason why I care about every single cpu cycle being spend in the kernel code. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
