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

From: Rik van Riel (riel@conectiva.com.br)
Date: Sun Aug 26 2001 - 14:52:11 EST


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

-- 
IA64: a worthy successor to i860.

http://www.surriel.com/ http://distro.conectiva.com/

Send all your spam to aardvark@nl.linux.org (spam digging piggy)

- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/



This archive was generated by hypermail 2b29 : Fri Aug 31 2001 - 21:00:21 EST