Re: 2.6.10-rc3: kswapd eats CPU on start of memory-eating task

From: Ed Tomlinson
Date: Mon Dec 20 2004 - 07:08:58 EST

On Monday 20 December 2004 02:44, Nick Piggin wrote:
> Andrew Morton wrote:
> > Voluspa <lista4@xxxxxxxxx> wrote:
> >
> >>Would be nice though if someone else could verify...
> >
> >
> > Well I'd love to, but afaik the only workloads which we currently know of
> > involve complex userspace apps which I have no experience running.
> >
> > Did anyone come up with a simple step-by-step procedure for reproducing the
> > problem? It would be good if someone could do this, because I don't think
> > we understand the root cause yet?
> >
> I admit to generally being in the same boat as you with respect to
> running complex userspace apps.
> However, based on this and other scattered reports, I'd say it seems
> quite likely that token based thrashing control is the culprit. Based
> on the cost/benefit, I wonder if we should disable TBTC by default for
> 2.6.10, rather than trying to fix it, and try again for 2.6.11?
> Rik? Andrew?
> Also, it would be nice to have a sysctl to *completely* disable TBTC,
> that would make testing easier.

Except that disabling it (with 0) reportedly did not solve the problem. There is
a possibility that its a more complex issue...

Ed Tomlinson
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