Re: Can linux support ccNUMA machine now?

From: Andreas Dilger (adilger@turbolabs.com)
Date: Thu Jan 24 2002 - 14:19:52 EST


On Jan 24, 2002 10:50 -0800, William Lee Irwin III wrote:
> On Thu, Jan 24, 2002 at 02:15:30PM -0200, Denis Vlasenko wrote:
> > Looks like running x86 with more than 16GB RAM is not a good idea.
> > If you need it, you need 64bit arch.

Actually, Andrea made a patch to move the page tables into HIMEM on
such machines. I believe it is in the latest -aa patch.

> Reducing overhead helps all boxen everywhere all the time. Turning the
> kernel upside-down for the corner case of 64GB isn't worth it, but
> finding more graceful ways to fail than not booting with no visible
> error messages, and perhaps extending the range of configurations where
> the kernel actually functions (within reason) by reducing space
> overhead is worthwhile.

Yes, there also have been several patches floating around to reduce
the size of struct page. I don't think any are in the kernel yet.

Cheers, Andreas

--
Andreas Dilger
http://sourceforge.net/projects/ext2resize/
http://www-mddsp.enel.ucalgary.ca/People/adilger/

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