Large SGA in Linux?

From: Gene <homang_at_pcisys.net>
Date: Thu, 26 Aug 1999 22:13:48 -0600
Message-ID: <rsc43gd8j7171@corp.supernews.com>

Anyone running Oracle 8.0.5.X on a Red Hat 6.0 box with a large SGA?

I have a Dell server with 2gigs of RAM. If I modify the
/usr/src/linux/include/asm/shmparam.h to set SHMMAX to
1gig and rebuild the kernel, changing nothing else, I can get a 500-600meg SGA (which is what I want). However, linux by default only recognizes upto 1gig of physical RAM. Therefore, I have changed the PAGE_OFFSET value in
/usr/src/linux/include/asm/page.h (and the other file noted in the
text of page.h) to 0X80000000 (the hex value of 2 gigs) to use my extra memory. Now, however, when I rebuilt the kernel I get all of my memory, but I can only allocate a shared memory segment of around 180megs. Anything larger than that fails.

I cannot for the life of me figure out what is going wrong here.

Any ideas?

Thanks,
Gene... Received on Thu Aug 26 1999 - 23:13:48 CDT