Martin Shepherd wrote:
> On Wed, 13 May 2009, Jan Kiszka wrote:
>> ...
>> Martin, could you check if this helps you, too?
> It doesn't appear to help. To check, first I turned on the HPET and PM
> timer options, and recompiled the kernel without your patch, to verify
> that this reproduced the problem. I then manually applied your patch
> to include/asm-generic/xenomai/hal.h in the kernel source tree,
> recompiled the kernel, installed etc, and rebooted. However even with
> the patch in place, whenever I ran:
>   dd if=/dev/zero of=/dev/null count=20000000
> then initially top showed that dd was getting very little CPU time
> (<10%), then after 30 seconds or so, the system became completely
> unresponsive until the dd ended. This is how it acts without the patch
> as well. So it doesn't appear that the patch has made any difference
> to this problem.

Hmm, so there is no Xenomai task running during this test, just Linux
load? Tried to reproduce with my kernel here (both HPET and PM enabled,
as usual), but no success. Strange.

> Note that I applied the patch to Xenomai 2.5-rc1 in linux kernel
> If the patch somehow relies on head, tell me, and I'll
> endeavor to set up a new kernel using that.

The patch must cleanly apply as is on -rc1, any later changes did not
affect its context.


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