Re: Over-eager swapping

[Chris Webb]

Lee Schermerhorn <Lee.Schermerhorn@xxxxxx> writes:

> On Wed, 2010-08-18 at 23:21 +0800, Wu Fengguang wrote:
> > Andi, Christoph and Lee:
> > 
> > This looks like an "unbalanced NUMA memory usage leading to premature
> > swapping" problem.
> 
> What is the value of the vm.zone_reclaim_mode sysctl?  If it is !0, the
> system will go into zone reclaim before allocating off-node pages.
> However, it shouldn't "swap" in this case unless (zone_reclaim_mode & 4)
> != 0.  And even then, zone reclaim should only reclaim file pages, not
> anon.  In theory...

Hi. This is zero on all our machines:

# sysctl vm.zone_reclaim_mode
vm.zone_reclaim_mode = 0

Cheers,

Chris.
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