Messages in this thread | | | Date | Fri, 2 Mar 2007 13:52:43 -0800 | From | Andrew Morton <> | Subject | Re: The performance and behaviour of the anti-fragmentation related patches |
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On Fri, 02 Mar 2007 16:19:19 -0500 Rik van Riel <riel@redhat.com> wrote:
> Bill Irwin wrote: > > On Fri, Mar 02, 2007 at 01:23:28PM -0500, Rik van Riel wrote: > >> With 32 CPUs diving into the page reclaim simultaneously, > >> each trying to scan a fraction of memory, this is disastrous > >> for performance. A 256GB system should be even worse. > > > > Thundering herds of a sort pounding the LRU locks from direct reclaim > > have set off the NMI oopser for users here. > > Ditto here.
Opterons?
> The main reason they end up pounding the LRU locks is the > swappiness heuristic. They scan too much before deciding > that it would be a good idea to actually swap something > out, and with 32 CPUs doing such scanning simultaneously...
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