Re: HT scheduler: is it really correct? or is it feature of HT?

["Tetsuji \"Maverick\" Rai" <tetsuji.rai@gmail.com>]

On 5/19/05, Con Kolivas <kernel@kolivas.org> wrote:
> ------------snip---------------
> Hyperthread sibling cpus share cpu power. If you let a nice 19 task run full
> power on the sibling cpu of a nice 0 task it will drain performance from the
> nice 0 task and make it run approximately 40% slower. The only way around
> this is to temporarily make the sibling run idle so that a nice 0 task gets
> the appropriate proportion of cpu resources compared to a nice 19 task. It is
> intentional and quite unique to the linux cpu scheduler as far as I can tell.
> On any other scheduler or OS a nice 19 "background" task will make your
> machine run much slower.
> 
> Cheers,
> Con
> 

Thanks.   I understood it's a feature of linux kernel and am satisfied
with it.  Actually on Windows xp my application sometimes slows down
maybe due to inpropoer scheduler.

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