Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3

[Ingo Molnar]

* Michael K. Edwards <medwards.linux@xxxxxxxxx> wrote:

> On 2/22/07, Alan <alan@xxxxxxxxxxxxxxxxxxx> 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 ...

	Ingo
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/