Windows manages memory differently

By: Howard Chu (hyc.delete@this.symas.com), May 14, 2007 11:17 am
Room: Moderated Discussions
Tzvetan Mikov (tzvetanmi@yahoo.com) on 5/13/07 wrote:
---------------------------
>So it is conceivable that the trouble you app is having with more than 1.5GB RAM
>under XP may not be so much a HIGHMEM issue, but a matter of XP not being optimized
>for such amount of RAM. The kernel is pretty old.

That's probably true. When I ran WindowsXP on my Centrino laptop with 2GB RAM, it only tended to use at most 768MB or so. Even when I had tweaked the registry to use all available RAM for fs cache it never used more than about 200MB for cache, and it paged out everything else. Even though over 1.2GB of free RAM was available. The only time I saw more than 1GB of RAM in use was when a particular app specifically allocated that much. (Typically either VMware with a 1GB VM, or some audio or video editor...)

> So, it would be interesting to run the same test with 32-bit Vista.

Now I run Linux as my primary OS and Windows is in the VM, but I haven't fired that up in months. Just haven't needed it any more. I don't expect I'll ever install another MS OS again.
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