Re: [Lse-tech] Re: 10.31 second kernel compile

Richard Gooch
2002-03-16T20:29:51Z

yodaiken@fsmlabs.com writes:
> On Sat, Mar 16, 2002 at 09:05:04PM +0100, Andi Kleen wrote:
> > That will hopefully change eventually because 2M pages are a bit help for
> > a lot of applications that are limited by TLB thrashing, but needs some
> > thinking on how to avoid the fragmentation trap (e.g. I'm considering
> > to add a highmem zone again just for that and use rmap with targetted
> > physical freeing to allocating them)
>
> To me, once you have a G of memory, wasting a few meg on unused
> process memory seems no big deal.

I'm not happy to throw away 2 MiB per process. My workstation has 1
GiB of RAM, and 65 processes (and that's fairly low compared to your
average desktop these days, because I just use olwm and don't have a
fancy desktop or lots of windows). You want me to throw over 1/8th of
my RAM away?!?

And in fact, isn't it going to be more than 2 MiB wasted per process?
For each shared object loaded, only partial pages are going to be
used. *My* libc is less than 700 KiB, so I'd be wasting most of a page
to map it in.

I want that 1 GiB of RAM to be used to cache most of my data. Those
NASA 1km/pixel satellite mosaics of the world are pretty big, you know
(21600x21600x3 per hemisphere:-).

Regards,

Richard....
Permanent: rgooch@atnf.csiro.au
Current: rgooch@ras.ucalgary.ca