On Fri, 28 Sep 2007, Mel Gorman wrote:
> Minimally, SLUB by default should continue to use order-0 pages. Peter has
> managed to bust order-1 pages with mem=128MB. Admittedly, it was a really
> hostile workload but the point remains. It was artifically worked around
> with min_free_kbytes (value set based on pageblock_order, could also have
> been artifically worked around by dropping pageblock_order) and he eventually
> caused order-0 failures so the workload is pretty damn hostile to everything.
SLAB default is order 1 so is SLUB default upstream.
SLAB does runtime detection of the amount of memory and configures the max
order correspondingly:
from mm/slab.c:
/*
* Fragmentation resistance on low memory - only use bigger
* page orders on machines with more than 32MB of memory.
*/
if (num_physpages > (32 << 20) >> PAGE_SHIFT)
slab_break_gfp_order = BREAK_GFP_ORDER_HI;
We could duplicate something like that for SLUB.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
