Messages in this thread | | | Subject | Re: Attempted summary of "RT patch acceptance" thread, take 2 | From | Daniel Walker <> | Date | Mon, 11 Jul 2005 10:25:28 -0700 |
| |
On Mon, 2005-07-11 at 10:19 -0700, Paul E. McKenney wrote:
> OK, interesting point, though this would apply only to interrupt latency, > not to scheduling latency or to latency for any other system services, > right?
Only for interrupt latency, that I know of.
> Do you believe that the 50-us delay measured by Kristian and Karim was > due to APM or due to hardware (as Karim suspected)? If the latter, > any guesses as to the cause of the holdup? 50 us is a -really- long > time for ~100 instructions on today's hardware, even if each instruction > misses the cache!
There are ~100 interrupt off critical sections. Those sections can be variable numbers of instructions. I would imagine that whatever maximum latency that Kristian and Karim found is the maximum for their hardware.
Daniel
- 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/
| |