On Mon, Feb 26, 2007 at 07:51:19AM -0800, Linus Torvalds wrote:
> > Commit: 2ff2d3d74705d34ab71b21f54634fcf50d57bdd5
> > Author: Stephane Eranian <[EMAIL PROTECTED]> Tue, 13 Feb 2007 13:26:22 +0100
> >
> > [PATCH] i386: add idle notifier
>
> Interesting. It doesn't touch floppy at all, but it *does* seem to play
> around with irq state.
Side note: this patch adds several function calls (4), several additional
L1 cache touches and a generally inefficient code path to *every single
interrupt that exits from the idle poll*, not to mention the extra (useless,
as it doesn't get used on 99.9% of deployed systems) function call and cache
touches to every single interrupt. Keep in mind that systems acting as
routers will often be sitting in the idle loop when processing interrupts.
At the very least this overhead (which is noticable on profiles) should be
configurable. I don't think that my 586 class embedded routers really need
this crap to be going into the kernel.
-ben
--
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