Re: 2.5.70-mm9

From: Nick Piggin (
Date: Sat Jun 14 2003 - 23:14:57 EST

Mingming Cao wrote:

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