Re: [patch 13/14] x86_64: Use common functions in cluster and physflatmode

[Zwane Mwaikambo]

On Fri, 9 Sep 2005, Ashok Raj wrote:

> In general we need
> 
> flat_mode - #cpus <= 8 (Hotplug defined or not, so we use mask version 
>                        for safety)
> 
> physflat or cluster_mode when #cpus >8.

I agree there.

> If we choose physflat as default for #cpus <=8 (with hotplug) would make
> IPI performance worse, since it would do one cpu at a time, and requires 2 
> writes per cpu for each IPI v.s just 2 for a flat mode mask version of the API.

I don't see the benefit then :/ I certainly hope we don't go that route.

Thanks,
	Zwane

-
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/