Date: Sun, 3 Oct 2004 13:02:33 +0200 From: Andrea Campi <andrea+freebsd_hackers@webcom.it> To: "Bruce R. Montague" <brucem@mail.cruzio.com> Cc: durham@jcdurham.com Subject: Re: Sudden Reboots Message-ID: <20041003110233.GA624@webcom.it> Resent-Message-ID: <20041003110815.GB624@webcom.it> In-Reply-To: <200410020334.i923YbYB000383@mail.cruzio.com> References: <200410020334.i923YbYB000383@mail.cruzio.com>
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On Fri, Oct 01, 2004 at 08:34:37PM -0700, Bruce R. Montague wrote:
> proposed. Instead of having a page table entry for
> each page of virtual address space, these systems
> have the equivalent of a page table entry for each
> page of _physical_ memory. All addresses are effectively
[...]
> disk-block. This requires more expensive hardware
> then a simple addition, but such systems only require
> a page table entry for every page of physical memory.
> These systems have been built from early days, but
> are typically not competitive with VM systems that
> require simple addition. (I think the IBM AS/400 is
> the only widely-used commercial hardware using this
> approach) At some point address space growth, cheap
> associative lookup memories, and required page table
> size may make this approach competitive.
Actually, all Power and PowerPC chips have this... It's one of
the reasons why IBM servers based on these chips can boast very
low overheads in several areas.
Bye,
Andrea
--
The best things in life are free, but the
expensive ones are still worth a look.
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