Re: kswapd @ 60-80% CPU during heavy HD i/o.

[Rik van Riel <riel@conectiva.com.br>]

On Tue, 2 May 2000, Stephen C. Tweedie wrote:
> On Tue, May 02, 2000 at 02:06:20PM -0300, Rik van Riel wrote:
> > > do the smart things I was mentining some day ago in linux-mm
> > > with NUMA.
> > 
> > How do you want to take care of global page balancing with
> > this "optimisation"?
> 
> You don't.  With NUMA, the memory is inherently unbalanced, and you
> don't want the allocator to smooth over the different nodes.

Ermmm, a few days ago (yesterday?) you told me on irc that we
needed to balance between zones ... maybe we need some way to
measure "memory load" on a zone and only allocate from a different
NUMA zone if:

	local_load        remote_load
	----------   >=   -----------
	1.0               load penalty for local->remote

(or something more or less like this ... only use one of the
nodes one hop away if the remote load is <90% of the local
load, 70% for two hops, 30% for > 2 hops ...)

We could use the scavenge list in combination with more or
less balanced page reclamation to determine memory load on
the different nodes...

regards,

Rik
--
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