> > Is there a way in the kernel startup code (or anywhere in kernel
> > for that matter) to determine what portions of physical system
> > RAM are cached?
>
> The extended memory queries from the BIOS (E820) do actually provide this
> information if I remember rightly
Well, and the same bios call reports ROM memory as being usable RAM on
my toshiba :-).
If you stay away from 640KB..1MB region, common possibilities are that
everything >64MB is not cached, or that everything >16MB is not
cached. It should be rather easy to benchmark that.
Pavel
-- I'm really pavel@ucw.cz. Look at http://195.113.31.123/~pavel. Pavel Hi! I'm a .signature virus! Copy me into your ~/.signature, please!- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.tux.org/lkml/