Re: Scaling noise

Larry McVoy
2003-09-04T02:51:17Z

On Wed, Sep 03, 2003 at 06:12:53PM -0700, William Lee Irwin III wrote:
> On Wed, Sep 03, 2003 at 02:51:35PM -0700, William Lee Irwin III wrote:
> >> This is only truly feasible when the nodes are homogeneous. They will
> >> not be as there will be physical locality (esp. bits like device
> >> proximity) concerns.
>
> On Wed, Sep 03, 2003 at 05:58:22PM -0700, Larry McVoy wrote:
> > Huh? The nodes are homogeneous. Devices are either local or proxied.
>
> Virtualized devices are backed by real devices at some level, so the
> distance from the node's physical location to the device's then matters.

Go read what I've written about this. There is no sharing, devices are
local or remote. You share in the page cache only, if you want fast access
to a device you ask it to put the data in memory and you map it. It's
absolutely as fast as an SMP. With no locking.
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Larry McVoy lm at bitmover.com http://www.bitmover.com/lm