RFC: Page size on PPC/PPC64 builders

Jarod Wilson jwilson at redhat.com
Mon Mar 3 19:02:51 UTC 2008


On Monday 03 March 2008 01:39:59 pm Josh Boyer wrote:
> Jarod Wilson <jwilson at redhat.com> wrote:
> > On Monday 03 March 2008 12:25:24 pm Bill Nottingham wrote:
> > > David Woodhouse (dwmw2 at infradead.org) said:
> > > > For 4KiB pages:
> > > >  - Makes life 'easier' for PPC builds, to stop people whining about
> > > > it finding their bugs for them.
> > > >  - Consistent with what we actually ship in Fedora.
> > >
> > > - wastes less memory on lower-mem ppc machines. Not that this should be
> > > a dealbreaker, but it's something to think about.
> >
> > Yeah, that's definitely an issue. Some of the ppc boxes in our internal
> > test setup have "only" 1G of RAM, and when the system is under load[*],
> > you can run out of free pages and start oom-killing stuff pretty quick
> > w/64k pages...
> >
> > [*] http://www.codemonkey.org.uk/projects/scrashme/scrashme.git/
>
> I think you're both slightly confused.  This is for switching the
> _builders_ back to a 4KiB page kernel.  Not Fedora, which is already
> 4KiB pages.

Sorry, didn't follow the whole thread. Thought we were providing rationale for 
why we wouldn't want to make the Fedora kernel also 64K pages.


-- 
Jarod Wilson
jwilson at redhat.com




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