Jan Kiszka wrote:
> Gilles Chanteperdrix wrote:
>> Jan Kiszka wrote:
>>> Hi Gilles,
>>>
>>> I'm currently facing a nasty effect with switchtest over latest git head
>>> (only tested this so far): running it inside my test VM (ie. with
>>> frequent excessive latencies) I get a stalled Linux timer IRQ quite
>>> quickly. System is otherwise still responsive, Xenomai timers are still
>>> being delivered, other Linux IRQs too. switchtest complained about
>>>
>>>     "Warning: Linux is compiled to use FPU in kernel-space."
>>>
>>> when it was started. Kernels are 2.6.28.9/ipipe-x86-2.2-07 and
>>> 2.6.29.3/ipipe-x86-2.3-01 (LTTng patched in, but unused), both show the
>>> same effect.
>>>
>>> Seen this before?
>> The warning about Linux being compiled to use FPU in kernel-space means
>> that you enabled soft RAID or compiled for K7, Geode, or any other
> 
> RAID is on (ordinary server config).

By the way, I wonder how MMX accelerated software raid works on K7,
since the way I understand the code, calls to kernel_fpu_begin() can not
be nested.

If you think they can be nested, then we can make switchtest test fpu in
Linux kernel-space when these options are enabled.

-- 
                                                 Gilles.

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