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Date: Sat, 06 Aug 2011 10:37:10 -0500
From: Nathan Whitehorn <nwhitehorn@freebsd.org>
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Subject: Re: Lags and setjmp
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On 08/05/11 10:47, Super Bisquit wrote:
> The file /usr/src/sys/powerpc/powerpc/setjmp.S has
>
> #ifdef __powerpc64__
>
>   at line nine. Maybe this is affecting the system because:
> the lag seems to occur on Xorg/Xserver with the cursor having to be moved
> before there is a response.
> I'm wondering if setting the vale to powerpc instead of powerpc64 would stop
> this action.
>

It wouldn't for the reason Justin said, and this file only applies to 
the kernel besides. I've also never experienced this bug you're 
referring to. Is X using longjmp/setjmp() internally? One thing we do 
not do is save/restore FP registers for long jumps. It's not required by 
the spec, but Linux does do it.
-Nathan