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SubjectRe: HT and idle = poll
Date
On Thursday 06 March 2003 03:08 pm, Linus Torvalds wrote:
> On 6 Mar 2003, Alan Cox wrote:
> > idle=poll probably needs to be doing "rep nop" in a tight loop.
>
> We already do that. It's not enough. The HT thing will still steal cycles
> continually, since the "rep nop" is really only equivalent to a
> "sched_yield()".

(Perhaps a naive idea) Right now, there is a single "rep nop" per poll. What
happens if you unroll the loop a few times:

while (!condition) {
cpu_relax();
cpu_relax();
cpu_relax();
}

? I have no HT hardware so can't test this.

-Eric
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