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Re: Sleazy FPU optimization
On 11 Feb 2008, at 18:43, Joerg Sonnenberger wrote:
Linux 2.6.20 and above has an interesting optimization for lazy FPU
We've been discussing whether or not it is worth to do lazy FPU
saving at all. Most programs will use the FPU on i386 anyway, e.g. if
printf is used. I'm not sure it will actually help.
It is probably also hurts performance on a SMP system if the kernel
switch to a thread and its FPU context is on a different CPU.
Matthias Scheler http://zhadum.org.uk/
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