From owner-freebsd-current@FreeBSD.ORG  Wed Jan 17 20:58:11 2007
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From: Ivan Voras <ivoras@fer.hr>
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Cc: freebsd-current@freebsd.org, freebsd-arch@freebsd.org
Subject: Re: [PATCH] Mantaining turnstile aligned to 128 bytes in i386 CPUs
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Matthew Dillon wrote:

>     * Saving the FP state.  The kernel doesn't have to save or restore
>       anything if userland was not using the floating point unit.  In
>       fact, the kernel doesn't even need to FNINIT!  All the kernel nee=
ds
>       to do is CLTS and FNCLEX to make the FP unit usable for media cop=
y
>       instructions, then set CR0_TS when it is finished.

Does the same hold true with kernel threads in FreeBSD (e.g. two threads
using FPU)?




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