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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
context saving:

We've been discussing whether or not it is worth to do lazy FPU context
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 wants to
switch to a thread and its FPU context is on a different CPU.

        Kind regards

Matthias Scheler                           http://zhadum.org.uk/

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