Mingming Cao wrote:

On Sat, 2003-06-14 at 01:01, Andrew Morton wrote:

quoted

Was elevator=deadline observed to fail in earlier kernels?  If not then it
may be an anticipatory scheduler bug.  It certainly had all the appearances
of that.

Yes, with elevator=deadline the many fsx tests failed on 2.5.70-mm5.

quoted

So once you're really sure that elevator=deadline isn't going to fail,
could you please test elevator=as?

Ok, the deadline test was run for 10 hours then I stopped it (for the
elevator=as test).  

But the test on elevator=as (2.5.70-mm9 kernel) still failed, same
problem.  Some fsx tests are sleeping on io_schedule().  

So by failed, you just mean stuck in io_schedule? Are you sure
they are permanently stuck there? Is any progress being made?
I have tried this test, and often some or most of the processes
wait in io_schedule for a while, but do get woken.



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