Re: [PATCH] vmscan: raise the bar to PAGEOUT_IO_SYNC stalls

From: Pekka Enberg
Date: Sat Jul 31 2010 - 14:09:41 EST

On Sat, Jul 31, 2010 at 8:59 PM, Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote:
> On Sat, Jul 31, 2010 at 08:55:57PM +0300, Pekka Enberg wrote:
>> Do you have CONFIG_SLUB enabled? It does high order allocations by
>> default for performance reasons.
> Yes. This is a kernel using slub.

You can pass "slub_debug=o" as a kernel parameter to disable higher
order allocations if you want to test things. The per-cache default
order is calculated in calculate_order() of mm/slub.c. How many CPUs
do you have on your system?
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