Messages in this thread | | | Date | Tue, 11 Jul 2006 09:48:08 -0700 | From | Mike Kravetz <> | Subject | Re: [RFC PATCH -rt] Priority preemption latency |
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Hi Ingo,
As you can see from the note below, we are still having issues with this testcase. As a reminder Darren's mail with a pointer to the new testcase is at:
http://www.uwsg.indiana.edu/hypermail/linux/kernel/0606.1/0729.html
When run with the '-i' option it fails on a regular (aprox 50% on 4 way) basis. Any insight into what may be happening would be appreciated.
Thanks, -- Mike
On Thu, Jun 15, 2006 at 02:06:58PM -0700, Mike Kravetz wrote: > On Mon, Jun 12, 2006 at 08:38:24AM -0700, Darren Hart wrote: > > I started running this version of the patch with prio-preemt in a loop > > over 10 hours ago, and it's still running. This seems to be the right fix. > > Unfortunately, this test did eventually fail over in our environment. > John Stultz added the concept of 'interrupter threads' to the testcase. > These high priority RT interrupter threads, occasionally wake up and > run for a short period of time. Since these new threads are higher > priority than any other, they theoretically should not impact the > testcase. This is because the primary purpose of the testcase is to > ensure that lower priority tasks do not run while higher priority tasks > are waiting for a CPU. > > After adding these interrupter threads, the tetscase fails (on a system > here) about 50% of the time. An updated version of prio-preempt.c is > attached. It needs the same headers/makefile/etc as originally provided > by Darren. - 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/
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