Re: userspace irq balancer

Zwane Mwaikambo
2003-05-27T02:44:46Z

On Mon, 26 May 2003, William Lee Irwin III wrote:

> On Mon, May 26, 2003 at 10:15:23PM -0400, Zwane Mwaikambo wrote:
> > Ok there are 16 IOAPICs on an 8quad, but really if we start banging on
> > that lock someone is doing way too much hardware access...
>
> It's done to acknowledge every interrupt. Also, there is additional
> cost associated with bouncing the lock's cacheline.

Bah, determining owning ioapic of an irq would get too ugly, you can have
the same irq connected to multiple ioapics so which to lock?

Zwane
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