Gilles Chanteperdrix wrote:
> 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 18.104.22.168/ipipe-x86-2.2-07 and
>>>> 22.214.171.124/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.
Sorry, I haven't looked that close into the in-kernel FPU handling so
far. What users are nested in the standard kernel? Or is it RAID in itself?
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