Re: What is the truth about Linux 2.4's RAM limitations?

Chris Wedgwood
2001-07-10T18:44:26Z

On Tue, Jul 10, 2001 at 02:28:54PM -0400, Brian Gerst wrote:

Jesse Pollard wrote:

> If the entire page table were given to a user, then a full cache
> flush would have to be done on every context switch and system
> call. That would be very slow, but would allow a full 4G address
> for the user.

A full cache flush would be needed at every entry into the kernel,
including hardware interrupts. Very poor for performance.

Why would a cache flush be necessary at all? I assume ia32 caches
where physically not virtually mapped?

--cw