Re: [resent PATCH] Re: very slow parallel read performance

Rik van Riel
2001-08-26T19:53:29Z

On Sun, 26 Aug 2001, Daniel Phillips wrote:
> On August 26, 2001 08:39 pm, Rik van Riel wrote:
> > On Sun, 26 Aug 2001, Daniel Phillips wrote:
> >
> > > There's an obvious explanation for the high loadavg people are seeing
> > > when their systems go into thrash mode: when free is exhausted, every
> > > task that fails to get a block in __alloc_pages will become
> > > PF_MEMALLOC and start scanning.
> >
> > If you ever tested this, you'd know this is not true.
>
> Look at this, supplied by Nicolas Pitre in the thread "What version of
> the kernel fixes these VM issues?":

His kernel is running completely out of memory, with no
swap space configured.

This is very different from a system which is thrashing
because of the IO load.

regards,

Rik
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