Messages in this thread | | | Date | Thu, 10 Jan 2002 15:04:59 -0800 (PST) | From | Davide Libenzi <> | Subject | Re: [patch] O(1) scheduler, -G1, 2.5.2-pre10, 2.4.17 (fwd) |
| |
On Fri, 11 Jan 2002, Ingo Molnar wrote:
> indeed. The question is, should we migrate processes around just to get > 100% fairness in 'top' output? The (implicit) cost of a task migration > (caused by the destruction & rebuilding of cache state) can be 10 > milliseconds easily on a system with big caches.
10 ms is exactly what i've observed while i was coding the BMQS balance code. Leaving a cpu idle for more than 10ms will make real tests like kernel builds to suffer performance degradation. By using 10ms i always got the same time of the standard scheduler.
- Davide
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |