Re: Over-eager swapping

[Wu Fengguang]

On Wed, Aug 18, 2010 at 11:58:25PM +0800, Chris Webb wrote:
> 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

Chris, can you post /proc/vmstat on the problem machines?

Thanks,
Fengguang
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