Re: 2.6.13-mm3

Andrew Morton
2005-09-12T19:57:22Z

Sonny Rao <sonny@burdell.org> wrote:
>
> On Mon, Sep 12, 2005 at 02:43:50AM -0700, Andrew Morton wrote:
> <snip>
> > - There are several performance tuning patches here which need careful
> > attention and testing. (Does anyone do performance testing any more?)
> <snip>
> >
> > - The size of the page allocator per-cpu magazines has been increased
> >
> > - The page allocator has been changed to use higher-order allocations
> > when batch-loading the per-cpu magazines. This is intended to give
> > improved cache colouring effects however it might have the downside of
> > causing extra page allocator fragmentation.
> >
> > - The page allocator's per-cpu magazines have had their lower threshold
> > set to zero. And we can't remember why it ever had a lower threshold.
> >
>
> What would you like? The usual suspects: SDET, dbench, kernbench ?
>

That would be a good start, thanks. The higher-order-allocations thing is
mainly targeted at big-iron numerical computing I believe.

I've already had one report of fragmentation-derived page allocator
failures (http://bugzilla.kernel.org/show_bug.cgi?id=5229).