Messages in this thread | | | Date | Fri, 23 Feb 2007 11:22:53 +0100 | From | Ingo Molnar <> | Subject | Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3 |
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* Michael K. Edwards <medwards.linux@gmail.com> wrote:
> On 2/22/07, Alan <alan@lxorguk.ukuu.org.uk> wrote:
> > We don't use the FPU in the kernel except in very weird cases where > > it makes an enormous performance difference. The threadlets also > > have the same page tables so they have the same %cr3 so its very > > cheap to switch, basically a predicted jump and some register loads > > Do you not understand that real user code touches FPU state at > unpredictable (to the kernel) junctures? Maybe not in a database or a > web server, but in the GUIs and web-based monitoring applications that > are 99% of the potential customers for kernel AIO? > I have no idea what a %cr3 is, [...]
then please stop wasting Alan's time ...
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